Changes

=== Chains of Command ===

Set before the events of ''Nightbringer'', in 999.M41, the Ultramarines 4th Company assault Bridge Two-Four on the planet of [[Thracia]] under Captain [[Idaeus]]. They seek to close up the flank of the main advance on a rebel held city, by destroying a series of bridges crossing a canyon. However they are attacked by the [[Night Lords]] [[Legion]], losing their [[Techmarine]] in the process and the ability to trigger the explosives placed on the bridge. Captain Idaeus is fatally injured and concocts a non-Codex pattern plan where he triggers the explosives with a krak grenade, destroying the bridge and himself. Before doing so, Idaeus passes his Captaincy and [[power sword]] to [[Uriel Ventris]], his Veteran Sergeant and second-in-command.

=== Consequences ===