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From Warhammer 40k - Lexicanum
Added Campaigns section and IA9 reference
[[Image:M2030040 P4Mb1.jpg|thumb|left|[[Marines]] vs. [[Genestealer]]s]]
The Ultramarines were the first [[Chapter|Space Marine Chapter]] to successfully repel a [[Tyranid]] invasion. With the help of [[Ultramar|Ultramar's]] [[PDF]], a [[Titan Legion]], and ships from [[Battlefleet Tempestus (fleet)|Battlefleet Tempestus]], [[Hive Fleet Behemoth]] was defeated at the [[Battle of Macragge]] in 745.[[M41]]. Since then, the Ultramarines have tirelessly hunted down the [[Tyranids]] to honour and avenge the fallen at the [[Battle for Macragge]]. They contribute a large number of [[Marines]] to the [[Deathwatch]] because of this. The Ultramarines were also instrumental in defeating [[Hive Fleet Kraken]] on [[Ichar IV]], and [[Hive Fleet Leviathan]] on [[Tarsis Ultra]].
==Notable Campaigns==
===The Jorun Retaliation===
143.M41. On route to the Gothic War an Imperial Battlegroup, the 15th Heraklion Ironclads, turned on their Commissariat attachment and went renegade. Investigations into this turn of events uncovered the foul xenos taint of Dark Eldar, who had managed to ensnare and corrupt General Jorun and his command structure. Jorun and his fleet raided planet after planet, enslaving whole populations for their masters. The full [[Howling Griffons]] chapter was given command of the strike force, with support from the Ultramarines and [[Sons of Orar]] chapters. <sup>15</sup>
==Organisation==
*<sup>13</sup>: [[The Chapter's Due (Novel)]], Graham McNeill.
*<sup>14</sup>: US [[White Dwarf]] 288, p. 115
*<sup>15</sup>: [[Imperial Armour Volume Nine - The Badab War - Part One]], p126
==See also==
