Hephastion Campaign

The Hephastion Campaign was the first Imperial campaign undertaken by the newly formed 203rd Combined Siege Regiment, which was formed from the remnants of the Valhallan Mechanised Infantry, 47th Death Korps Grenadiers, 63rd Armageddon Steel Legion Mechanised Infantry, 454th Cadian Shock Troops, following the severe casualties sustained by these regiments during the Taiga Worlds Campaign the previous year. Following their formation, they successfully utilised their expertise in precision artillery strikes and subterranean warfare, and took back the rebellious world of Hephastion Prime.

History
The campaign in the Hephastion System was launched in 994.M41 and marked the first deployment of the 203rd after it had been rearmed, resupplied, and redesignated as a siege regiment. Under the supervision of its no-nonsense commander, the 203rd developed a reputation for their skill in artillery fire as well as subterranean warfare. The sapping operations conducted by the regiment’s siege engineers is directly linked with the eventual success of the Imperial attack on Hephastion Prime's capital hive.