>The Adonis Palace Massacre was a battle waged sometime after the formation of the Great Rift.

>The war was waged on Cadmas Tertius as part of a general plan by the Eldar Craftworld Ulthwe, who sought to limit the growth of Chaos by culling traitorous or incompetent Imperial commanders and worlds that may allow its spread. Upon Cadmus Tertius the Eldar struck with a squadron of Hemlock Wraithfighters escorted by Crimson Hunters of the Shrine of the Shrieking Squall. Though they lost some aircraft to anti-aircraft fire, the remainder were able to bombard the spiretips of the ruling Imperial cities with waves of attacks that caused such despair that many within committed suicide. The strike stopped a ritual by the corrupt Imperial Cultists on the world summoned Slaaneshi Daemons into reality. Had this come to pass, the whole world would have been infested by Daemons and eventually subjected to Exterminatus.

>Afterwards the Eldar sent emissaries to explain their actions to the Imperials, but these were condemned as murderers and sent away at gunpoint. The survivors became driven to take revenge against the Eldar and under a false-flag parley, Imperial Navy forces from Cadmas Tertius opened fire on the Asuryani still monitoring the system. Hugely outnumbered, several Ulthwe ships were desetroyed before the rest could escape

>Altor Crusade

>The Altor Crusade was a campaign waged by the Ultramarines in M41. During the Altor Crusade a young Tigurius forewarned the Scouts of the 10th Company of a successive series of ambushes planned by Eldar Pathfinders. His warnings, initially heeded with a degree of skepticism, doubtless saved dozens of lives – rather than leading their recruits into deadly traps, the Sergeants instead called in fire support from the Chapter’s Stormtalons, which duly turned the awaiting Eldar snipers into grisly corpses with their assault cannon fire. He also warned Captain Agemman to arrive several hours early for the armistice talks with the Eldar Autarch. When the Eldar general arrived with his entourage, he found the jungle foliage that had concealed squads of waiting Striking Scorpions burned to stubble by Agemman’s Land Raider Redeemer, Infernal Retribution, and the Captain waiting with his relic blade drawn

>Battle of Arconar

>The Battle of Arconar took place in 861.M41 on the Feral World of Arconar where Marneus Calgar and the Ultramarines fought against a coalition of Eldar raiders. The Ultramarines attacked with such force that they managed to scatter the Eldar and capture their bases both on and off of the planet

>Battle of Threccia

>Losses/Survivors: Ynnari - Nearly all killed

>Outcome - Strategic Eldar victory

>The narrow Webway Portals had prevented the Eldar from utilizing their vehicles, and were thus forced to fight their way out of the ambush on foot.

>Benedictine War

>The Benedictine War was a War of Faith of the Imperium during the Age of Redemption. The operation targeted the Benedictine sub-sector and led by the Black Templars and five Sisters of Battle Orders, though it included many other armies of Faith.

>During the campaign, several Eldar worlds were captured and in the ensuing conflict two Black Templar High Marshals were slain in succession. Due to this, the Ecclesiarch himself declared an end to the war, claiming that they had achieved enough in the Emperor's name. However the new High Marshal Constantine continued the campaign regardless and the Black Templars alone successfully purged the remaining worlds of Xenos

>Blood of Khaine

>The Blood of Khaine was one of the mightiest vessels of Craftworld Iyanden's fleet.

>Battle of Bosphodia

>The Battle of Bosphodia was fought by the Death Guard and Eldar sometime after the formation of the Great Rift.

>Elements of the 5th and 6th Plague Companies engaged in a naval battle with Craftworld Saim-Hann and its fleet around the moons of Bosphodia. Before they are driven off, the Death Guard successfully boarded the Craftworld and spread their corruption through the territory of Wild Rider clan Sylthach. In desperation, Saim-Hann's Seer Council ordered ghost warriors to cut that part of the world-ship away with weapon fire. So devastating is the despair felt in that moment that it conjures Nurgle Daemons into the waystones of the surviving Sylthach clan members, possessing them and transforming them into insectile half-breeds

>Battle of the Burning Moon

>However, the last ship, in a final act of malice, launched a volley of Cyclonic Torpedoes at the undefended Craftworld, a level of firepower that could devastate Iyanden. Yriel realized his folly of using all of Iyanden's ships for attack, as the Flame of Asuryan was too far to intercept the torpedoes. Iyanden's own point-defense lasers managed to intercept 35 of the 36 torpedoes, but the last struck home and created a devastating impact on the Craftworld that killed tens of thousands of Eldar. Worse still, their Spirit Stones had also been destroyed and the slain were doomed to the torments of Slaanesh.

>Carnac Campaign

>After several inconclusive battles on Carnac's plains, Anrakyr marched on the World Spirit shrine and thus forced the Eldar into a direct confrontation. Though the two sides were well-matched in the ensuing bloodbath, the Necrons' hardiness countered the precise strikes of the Eldar and Carnac's tomb suddenly awakened, providing Anrakyr with the flood of reinforcements he needed to finally emerge victorious. The Eldar retreated, and Anrakyr allowed Trazyn to take the planet's World Shrine as a spoil of war.

>Purging of Centrati's Eye

>A Dark Eldar raiding party overtook a massive defence station nicknamed "Centrati's Eye", shipped off the station's personnel as slaves and turned its weapons on the cities of Centrati, killing thousands on the planet's surface.

>The Dark Eldar, however, were unaware of the presence of a Black Templars Battle Barge in orbit. The Black Templars were stationed on the other side of the planet when they received the distress voxes from the defence platform and detected the massive energy discharges directed at the surface

>The Black Templars in their turn assaulted the space station and to their surprise they faced not only Dark Eldar but also Eldar forces. Both enemies were fighting each other. The Black Templars did not care about this, and engaged both Xenos races and destroyed their forces over the coming months.

>Sacking of Colonia

>Also during the Sacking, a surprise assault by Eldar from Saim-Hann threatened to annihilate the Mortant VII. However the Eldar were forced to retreat after a single squad of the Catachan Devils under Gunnery Sergeant Harker ambushed the aliens from concealed positions and killed their Autarch with Heavy Bolter fire.

>Defence of Dimmamar

>The Defence of Dimmamar began in 858.M41 when Dimmamar, the birthplace of Sebastian Thor, comes under attack from Eldar of Craftworld Ulthwe without any warning. Seraphim Superior Amelda of the Order of the Bloody Rose immediately retaliates, leading her squads of Seraphim in a daring attack to slay the Eldar Farseer Kauerith. The Sisters initially manage to advance, they are eventually engulfed in a hurricane of psychic lightning. Though many of her companions fall, Amelda refuses to yield and advanced through the psychic storm, slaying the Farseer with a Bolter round to the head.

>Defense of Aurent

>Eldar forces from Craftworld Ulthwé attacked Cadian holdings on Aurent. Ursarkar Creed implemented a complex web of contingency plans and sealed, time-delayed orders coupled with psychic obfuscation provided by an entire coven of Primaris Psykers. Creed’s tactical genius overcame even the vaunted Eldar powers of prescience, securing an overwhelming Cadian victory at the very gates of Aurent’s Hive Primus

>Defense of Helioret

>The insane Witch-Idols of the Eldar Craftworld Magc'Sithraal led a brutal campaign of raids against Helioret, forcing the Blood Angels and Ordo Sinister to defeat the Xenos and cast their Craftworld into a nearby star

>Battle of Delugen

>The incident began when the Genestealer Cult Tendricul infiltrated the Imperial space station of Delugen. Sometime later, a strike force of Eldar Black Guardians from Craftworld Ulthwe descended upon the gyroscopic station. The Farseer Anathroelle Starseeker led her warriors into Delugen’s corridors. There they slew the Cult Tendricul in the most thorough fashion, putting every human they found to the sword. The station’s astropathic distress signal reached a Black Templars fleet, and whilst the Eldar were rooting the last of the humans from the station’s corridors, the boarding torpedoes of the Space Marines struck home. The Ulthwé Eldar were driven off, and the last few survivors of Delugen escape. Within a year, the symbols of the Cult Tendricul were seen on a dozen planets, including the Eldar maiden world Virgose

>Battle for the Ruins of Esko's Moon

>The Battle for the Ruins of Esko's Moon was a battle fought by the Tallarn Desert Raiders Imperial Guard against the Eldar in M41. During the battle Captain Al'rahem and his forces faced off against the Eldar who were using similar hit and run tactics. Al'rahem, however, won over the Eldar by creating an exacting crossfire with a platoon of his men after trekking halfway across the moon to the ruins and striking through the lightly defended southern pass in, which the Eldar had believed was impassable. Al'rahem claimed the head of the Eldar Autarch Kaliell, breaking the deadlock between the two sides.

>Battle of Exhubris II

>The sealed portals upon Exhubris II's grand archipelago are hidden within a landscape of pyramids, but the Adeptus Mechanicus forces from Stygies VIII makes it their mission to open them. The excavation is well under way when a large force of Eldar from Craftworld Ulthwe arrive without warning to assail the Mechanicus work teams. Stygies requests aid from a nearby Martian fleet. So determined is their defense that the reinforcements have time to make planetfall in great number, and the Eldar ground forces are hammered to ruin.

>Fortress Omega

>Fortress Omega is a Watch Fortress of the Deathwatch. At one point the fortress was assaulted by Eldar Corsairs who sought a doomsday sphere kept within. The Corsairs found only Venator Tactics Kill Teams within, who promptly ambushed the aliens. The sphere had in fact been a myth spread by Human mercenaries working for Black Shields to lure the xenos into the open.

>Ghodri Falsehood

>Meanwhile on the Human world of Ghodri Sekmet, Yvraine was preaching to a hidden group of Alaitoc Pathfinders high in the peaks. To the surprise of the Eldar however, local Imperial Guard forces on the world discovered their location and struck at their outpost. In a well-organized pincer assault, the Eldar found their line of retreat cut off by artillery fire. The Ynnari and Alaitoc forces fell back to their Webway Portal - only to find a strike force of Dark Eldar mercenaries bursting through. Caught between two foes, the Ynnari were decimated.

>The Trials of Ghoroi V

>The Trials of Ghoroi V was a battle between the Tau Empire and the Eldar in 811999.M41, which saw the Eldar ambush a Tau fleet; above the planet Ghoroi V, during the Third Sphere Expansion. The majority of the Tau's fleet was destroyed or crippled in the ambush and only a few Fire Warrior manged to evacuate and land on the acidic swamps of Ghhoroi V, with the Eldar pursing them soon afterwards. Though they were few in numbers, the Fire Warriros used a combination of shared targeting data and relentless missile bombardment to fight the larger Eldar force pursing them. Their attack caused the Eldar such heavy casualties in the battle, that they soon abandoned the fight and returned to their ships

>Scouring of Gnosis

>Battling the Eldar across the Gnosis System, Grimnar was able to defeat the Eldar on Gnosis Secundus, forcing Zephyrblade to retreat. The Autarch felt great frustration for having underestimated human foes.

>Battle for Grase Mesa

>The Battle for Grase Mesa was a battle between the White Scars and Eldar of Craftworld Yme-Loc in 869.M41. During the battle, an Eldar Windrider host is all but annihilated at Grase Mesa when White Scars bike and Land Speeder squadrons encircled their Xenos foes and launched a devastating enfilade on their flanks

>Battle of Hellabore

>The Battle of Hellabore was fought in 867.M41 between the Eldar and the Imperium. The conflict began when Craftworld Iyanden slaughtered the planetary council of the world of Hellabore before the seeds of damnation within their souls could manifest, something their Farseers had foreseen. However, ignorant of the true meaning of the attack, the Imperium retaliated by deploying the Crimson Fists. Most of Iyanden's forces had already departed by the time the Astartes arrived, but it fell to a small host of Ghost Warriors led by the Wraithlord Toralven Gravesong to hold the Crimson Fists back from the world's Webway Nexus while the last living Eldar made their escape. Their sacrifices were mourned by Iyanden ever after.

>Helrak Incursion

>In the incursion xenos used the Mote of Darkness – a Space Hulk of some extinct ancient gigantic xenos race. In one of the key battles, forces of Captain Dynares of the Obsidian Glaives 1st Company aggressively used the assault capabilities of his Land Raider, Valour Maximal, to cleanse the space hulk of filthy xenos.

>Idharae is an Eldar Craftworld that was assaulted in 852.M41 by the Invaders Space Marine Chapter and was reduced to a ruined hulk

>Ila-Manesh

>In 326.M33, a huge warband of the Night Lords descended from the darkness of the Warp on a mission of revenge against the Craftworld. Their aim was simply to eradicate the Craftworld's spirit stones, many of which had previously been stolen from the Crone World of Aesyl-Sar. While delivering justice for this past Eldar sin, the Night Lords unleashed several Defilers. One of these, Ghostcrusher, stood out as a particularly savage machine beast. The Daemon Engine spearheaded a Night Lords' assault upon the Shrine of Eldanesh, incinerating ancient tomes, crushing sacred totems, destroying spirit stones and burning the Guardians who attempted to prevent the desecration. So thorough were the Night Lords in their assault on Ila-Manesh that they left the Craftworld a tomb, with no artifacts and no living Eldar remaining

>The Battle of Ka'mais was a conflict between the Eldar and Tau Empire in 876.M39.

>After the Maiden World of Lilarsus was destroyed by the newly-expanding Tau Empire in retaliation for a raid on Kel'shan, Craftworld Iyanden retaliated against the Tau by attacking the Sept of Ka'mais. Much of the planet was reduced to rubble during the reprisals, but the Tau held firm and launched well-coordinated counter-attacks after the initial shock wore off. The Tau even recovered several Wraithguards, the technology of which fascinated the comparatively primitive aliens. Due to Tau tenacity, the conflict continued for several weeks until both sides discovered that the initial raid on Kel'shan was done by the Dark Eldar Archon Andross Klax. Iyanden disengaged, snubbing the Tau's hand of friendship but nonetheless pledged themselves to making Klax pay for the unnecessary Eldar blood he spilled

>Kodiak Prime

>During the War of Faith, Saint Celestine and the Adepta Sororitas defeated an Eldar conclave on the planet. Their victory is celebrated during the Blessing of the Wound festival on the planet Neva. The citizens honor Saint Celestine by having a reenactment of the battle, using live ammo.

>Lilia Mundi is a Feral World, under the jurisdiction of the Imperium of Man. The planet is well-known as a Black Templars recruiting world, but also as the site of a conflict between the Templars and the Eldar.

>The planet was attacked in the eighth century of the 41st Millennium by Eldar of the Saim-Hann Craftworld, after the Iron Bloods' failed to respond to an evacuation ultimatum issued by an envoy at a tribal contest. The small garrison of Templars was originally overrun by the Eldar forces of Triadhu Firesong and his adviser Oerlin Fargaze. Eldar battle technology was too advanced for the feral tribes, with anti-personnel skimmers exacting a large toll on the population.

>The tide turned with the arrival of reinforcements from the Templar strike barge Vigilant Might, under the command of Reclusiarch Verstelt, and the later arrival of the Crusade of Marshal Albrantinus.

>After Farseer Eldrad Ulthran foresaw an Imperial Explorator Fleet awakening Necrons entombed on Maedrax, he has the forces of Ulthwe quickly move through the Webway and ambush the human ships. The Eldar then make planetfall in force and attempt to purge the Necron presence before it can awaken. However a Battle Barge of the Blood Angels soon arrives, exacting a heavy toll on the Eldar. Worse still, the Necron presence is much higher then originally believed and an entire Dynasty awakens and overruns the system.

>Massacre on Sarlinn's World

>The Massacre on Sarlinn's World began, when an Eldar Craftworld's forces invaded the Chaos-held Sarlinn's World. Despite having the element of surprise though, the Eldar found themselves outnumbered and outmaneuvered, which forced them to retreat back to the Webway Portal they had emerged from. However the forces of Chaos would not let the Eldar escape easily and barely a tenth of the Craftworld's forces engaged in the campaign returned to their home.

>Battle at Midpoint

>The Battle at Midpoint began when an Eldar fleet attacked the massive space docks of the Imperium world Midpoint and nearly succeed in destroying them. However, disaster was averted when the Dark Angels fleet suddenly appeared and turned the tide of the battle. The Eldar were soon forced to retreat after the heavy firepower of The Rock annihilated the Xenos' capital ship, as well as half a dozen smaller vessels.

>Battle for Orar's Sepulchre

>Calgar, knocking enemies flying from the bulk of his armour, engaged the Avatar in single combat. The Avatar swung its sword, which had cut through armour so mercilessly, at the Chapter Master, and all seemed doomed for Calgar. At the last moment, however, Calgar slammed the palm of his hand into the sword and grabbed it with all his strength. The Gauntlets of Ultramar, great relics of the Chapter, buckled and warped, yet held for a brief moment. In that moment, the Avatar was helpless, and Calgar drove his other hand into its molten form. With a deafening roar, the Avatar exploded, leaving Calgar exhausted on the ground.

>Battle of Port Demesnus

>Keeping the truth of the ritual from allied Autarchs, Eldrad was able to get forces from Ulthwe and Saim-Hann to launch a diversionary attack on an Imperial Navy base on Coheria. This left the crystal moon largely undefended, and Eldrad and his Harlequin allies were able to begin the ritual undisturbed. However, a Deathwatch Kill-Team led by Artemis arrived. After a vicious battle, Artemis and his Battle-Brothers were able to destabilize the ritual and force Eldrad to flee as Coheria exploded.

>The Scalland Campaign was a battle of the Great Crusade which took place in the lead-up to the Horus Heresy

>A field test for the first thousand sets of Space Marine Mk VI Power Armour (provisionally dubbed the Mk V at the time, as the armour that eventually bore that designation had not yet been developed), the campaign was waged against the Eldar of the Scalland Sector. Raven Guard forces were chosen to conduct the operation despite their recent heavy losses in the Akum-Sothos Cluster. There is some speculation that certain Imperial commanders led by Perturabo pushed for the under-strength and bloodied Raven Guard to conduct the field tests in hopes of their failure and thus the cancellation the Mk VI project, which Perturabo hoped would spur the development of a new heavy assault variant in its place

>However, if that was Perturabo's intent, the plan backfired as the Raven Guard performed admirably against the Eldar forces. They used their advanced auto-senses and increased agility to hound the Eldar in a series of hit-and-run attacks. Originally just intended as a field test, the Raven Guard were actually able to expel the Eldar from the Sector altogether. As a result of their success, the Mk VI armour was approved for mass production. In the Raven Guard's Primarch Corax's honour, it was dubbed Corvus Armour.

>War in the Shedim Drifts

>What ensued was an apocalyptic battle on the surface of the arid world of Anark Zeta. The Legio Atarus was used as a part of a probing attack against the Eldar Webway Gate, which was successful in drawing Eldar Titans to battle. Heavy engaged and outnumbered by the Xenos machines, the promised support to the Legio Atarus by the Legio Mortis did not arrive while the Titans of the Legio Fureans, holding the Firebrands' flank, crumbled. A full demi-Legio of the Firebrands was encircled and all but destroyed, with only a single Warhound surviving the engagement able to still fight

>In the aftermath it was revealed that the attack had been a ruse, a distraction planned by Horus to divert the enemy away from the direct defense of their Craftworld. The plan worked, and the Luna Wolves destroyed Mor-rioh'i in a surprise assault.

>Siege of Somonor

>Confident of victory, Farseer Starbane launched his attack without waiting for the rest of the host - a mistake that would cost the Eldar dearly.

>Summoning an angry storm cloud to cover his retreat, Imotekh led his army into the darkness of the tombs below. Starbane, in his arrogance, ignored this obvious trap and pursued the Necrons and was soon trapped within the tombs when Quantum Shielding sealed the only exit. Imotekh then summoned a swarm of microscopic scarabs and then a wave of Flayed Ones that tore away at Starbane's trapped forces. As the Flayed Ones began to falter in the face of stiffening Eldar resistance, Imotekh released his final trap. He sent his legions of Immortals into the fray and the Eldar, packed in close formation to counter the Flayed Ones, were easy pickings for their heavy firepower. The Eldar were slaughtered and only one survived to bring news of the defeat to Alaitoc: Starbane himself. He told the Seer Council of Alaitoc that Imotekh had only taken his right hand whilst all the other captives were put to swift deaths.

>In the aftermath, Starbane was released to live out the rest of his days in humiliation. The Seer Council, for its part, planned to exact revenge against Imotekh by striking at the very heart of the Sautekh Dynasty itself.

>The Thule Intervention occurred in 978.M39, when a conclave of Eldar Farseers from the Iyanden Craftworld appeared without warning in the throne chamber of the High King of Thule. The inscrutable Farseers demanded the entire human population of Thule, be removed within a month or the Eldar would return to remove them by force. After their demands were delivered the Farseers vanished and, rather than face the wrath of the Eldar, the High King soon fled Thule and abandoned his people to their fate. A month later, with the human population still remaining, a large army from Craftworld Iyanden arrived at Thule - only to find a deployment of the Crimson Fists Chapter, arrayed in force against them. During the battle that followed, the Eldar found themselves trapped by the Crimson Fists and suffered heavy losses, before they finally managed to withdraw and escape from Thule.

>The Battle of Twilight's Ending began when the Eldar of Craftworld Iyanden formed a fragile alliance with the Tau of Sept World Vior'la to stop the predations of the Novokh Necron Dynasty. However, during the battle, Iyanden's Farseers soon realized that the Tau presented a far greater future threat to their Craftworld and the Eldar as a whole, and have now turned upon their former allies, even though the Novokh Dynasty has still not been defeated

>The Battle of Va'yun was a battle waged between the Tau and Eldar Corsairs during the Second Sphere of Expansion. It began when a band of Corsairs lured the forces of Commander Dawnsword into a deadly trap on Va'yun, seeking to capture the Ethereal Aun'Fyr. However the arrogant aliens underestimated the discipline and technology of the Tau and were driven off after a savage fight

>In 721.M41 the series of Eldar Corsair raids the planet suffered, were brought to an end when Captain Iscon of the Angels Sanguine Chapter led a mixed strike force, drawn from his own and several other Chapters, against the Eldar and defeated them

>The Purging of Yddylia was a war fought between the Deathwatch and Eldar of Craftworld Biel-Tan.

>After a string of strikes by Biel-Tan against the Garravissima Sub-Sector proves impossible to stop, Deathwatch forces from Fort Ajax were deployed to hunt the aliens. They eventually descended on the Maiden World pf Yddylia at the height of summer and set the world aflame. The Exodites of the planet fought hard to repel the Space Marines, but are overwhelmed and call for reinforcements from Biel-Tan. The Eldar reinforcements promptly arrive, but within a week the Autarch leading the expedition is killed by Deathwatch assassins