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The '''Dulan Campaign''' was a conflict between the [[Imperium]] and the [[Dulanian]]s, a technologically advanced human civilisation.{{Fn|1a}} It is most famous for the involvement of the [[Space Wolves]] and [[Dark Angels]], culminating in the famous incident of '''the Lion and the Wolf''' that began the tradition of honour duels that continues into the [[M41|41st Millennium]].{{Fn|2}}{{Fn|3}}

The '''Dulan Campaign''' was begun by the [[Imperial Army]], but after a series of heavy defeats for front-line divisions at the hands of the advanced [[Faash]], the [[Space Wolves]] [[Space Marine Legion|Legion]] were assigned to finish the campaign. In the early months, even they struggled to deal with the [[archaeotech]] employed by the enemy, taking some time to perfect the new tactics they rapidly adopted to counter the threat.{{Fn|1a}}

[[Jorin Bloodhowl]] and his [[13th Great Company]] hunted the Faash down across multiple systems, destroying a number of heavily fortified bastion stations. The speed of the enemy's ships, powered by elaborate fusion technology, made them impossible to catch in a straight pursuit, allowing many of the Faash to escape to the empire's throneworld of [[Dulan]]. In order to discover Dulan's location, Jorin staged an ambush by leaving six sub-warp interceptors on low power at the edge of the [[Ynniu System]], where they were able to ram and board a Dulanian hunter-killer vessel seeking to escape the fall of the bastion above [[Ynniu III]]. Jorin led a boarding party and was able to disable the [[warp drive]] by rupturing a promethium line, but two of his company fell to the [[Wulfen|Curse of the Wulfen]] during the battle.{{Fn|1a}}

[[Leman Russ (Primarch)|Leman Russ]] arrived in-system, ahead of his scheduled rendezvous with Jorin at [[Verillis]], bringing [[Ogvai Ogvai Helmschrot]] and the 3rd Great Company with him. He revealed that [[Lion El'Jonson]] had been on the same trail as them for two months, though he had had next to no contact with his brother. Russ insisted that the Space Wolves must be the first to reach Dulan to assuage the naysayers in the Imperial court who had arranged for the [[Dark Angels|First Legion]] to become involved. The [[Iron Priest]] Kloja was able to extract Dulan's location from the remains of the Faash ship, and the Space Wolves set out to beat the First there.{{Fn|1a}}

The Dark Angels reached Dulan first, its location identified by Lion El'Jonson from signs in the old annals. The fleet's capital class vessels held back, firing from a distance while escorts were sacrificed at close range to prevent the Faash from closing in with their shorter-ranged interference weapons. One of the largest [[battleship]]s was boarded by ten squads of Dark Angels from the ''Blade of Numarc'', intending to turn its weapons on the orbital defence halo. Before they were able, however, the Space Wolves arrived.{{Fn|1b}}

Russ met his brother aboard the ''Invincible Reason'' accompanied by [[Grimnir Blackblood]] and Ulbrandr, begging the Lion's pardon in front of several hundred Dark Angels - but whispering a warning that he would tear the Lion's throat out with his teeth if he ever fired on his sons again.{{Fn|1b}}

The Lion's plan for the invasion was to target the Tyrant [[Durath]]'s [[Crimson Fortress]]. Master Moriaen and the Sixth Order would establish a defensive perimeter to the east, Master Gahael and the Second Order would strike at the generators in the north to disable to fortress' shields, and the Lion would accompany Master [[Alajos]] and the Ninth Order to take the lesser citadels to the west and cut off reinforcements. Russ and the Space Wolves were to turn the original plan of a siege into a rapid strike, storming the Crimson Fortress.{{Fn|1b}}

When the Lion saw the Wulfen transmission, he immediately ordered the records erased. Having given his brother time and been unable to make contact, he decided to enact the teleport strike into the Tyrant's throne room with his [[Paladin (Dark Angels)|Paladin]]s. Met by the Tyrant alone, he offered Durath a final chance to surrender to the Imperium before decapitating him with a single stroke of the ''[[Lion Sword]]''.{{Fn|1c}}

Russ was enraged when he heard that the Lion had launched his teleport strike, leaving Jorin to burn the dead while he and the [[Einherjar]] took a [[stormbird]] to the Crimson Citadel. Furious at the sight of the Tyrant's head in the Lion's hand after he swore Russ would be allowed to claim what he saw as his rightful prey, the Wolf King punched the Lion in the chest. Surrounded by a circle of Paladins and the Einherjar each cheering on their father, the two primarchs crossed swords.{{Fn|1c}}

The Lion was gone when Russ woke. He later said that if he had not left, he believed he would have killed Russ.{{Fn|1d}}

After the duel between the Lion and the Wolf, it became a ritual for the Dark Angels and Space Wolves to field champions every time the Legions met{{Fn|4}} - usually to first blood.{{Fn|5a}}

The Compliance of Dulan{{Fn|1d}} was commemorated in a fresco in the [[Imperial Palace]] which survived the [[Battle of Terra]]. The Lion and Russ met by it when they arrived in the aftermath, and the Lion challenged Russ to finish their duel, this time to the death. When Russ made no move to defend himself, the Lion plunged the ''Lion Sword'' into his chest,{{Fn|1d}} but turned the blade at the last moment to ensure the blow was not fatal. This set aside the bad blood between the primarchs, and Russ wore black in mourning when he heard the Lion had [[Destruction of Caliban|died]].{{Fn|1e}}

Ten millennia later, the [[Dark Angels]] and [[Space Wolves]] still nominate champions to participate in honour duels whenever the two [[Chapter]]s serve side by side, though the details have drifted in the re-telling.{{Fn|2}}{{Fn|3}}

Both accounts agree that it was Russ who struck the first blow of a fight that lasted a day and a night before Russ, quick to both anger and mirth, broke out in laughter. El'Jonson, slow both to anger and forgiveness, considered the first blow treacherous and struck his brother unconscious. When Russ awoke, he found El'Jonson had left, deeming honour satisfied.{{Fn|2}}{{Fn|3}}

*~009.[[M31]] - [[Lion El'Jonson]] and [[Faffnr Bludbroder]] - the Lion fights as his own champion in [[Imperium Secundus]].{{Fn|4}}

*M31 - [[Otho (Dark Angel)|Otho]] and [[Haldor Twinfang]] - Haldor fights using ''[[Wyrdfast]]'', the axe taken from Alajos by Russ.{{Fn|1e}}

*[[Battles of the Great Crusade (List)]]

*[[Vendetta (Battle)|The Vendetta]]

*1: [[Leman Russ: The Great Wolf (Novel)]]

**{{Endn|1a}}: Chapter II