Astra Militarum - Notable Vostroyan Firstborn Regiments: 5th Vostroyan Firstborn Regiment - The 5th Vostroyan Regiment was commanded by none other than Lord Marshal Graf Harazahn, the supreme commander of the Imperial forces on Medusa V during the Fall of Medusa V campaign. The regiment defended Hive Euryales against the Forces of Chaos' assault tactics before the Warp Storm known as Van Grothe's Rapidity overwhelmed the planet.7th Vostroyan Firstborn Regiment - The 7th Vostroyan Regiment defended Hive Euryales on Medusa V alongside Lord Marshal Graf Harazahn and the 5th Vostroyan Regiment during the Fall of Medusa V campaign.9th Vostroyan Firstborn Regiment, "The Old Irascibles" - Earning their name the "Old Irascibles" through hundreds of battles, the vaunted 9th Vostroyan Regiment served for three and a half centuries during the late 41st Millennium. The 9th Vostroyan became one of the most veteran formations in the Segmentum Obscurus, before finally meeting their match on the world of Nimbosa. Around 790.M41, the 9th Vostroyan defended the Imperial world of Nimbosa against the T'au's effort to expand their burgeoning alien empire and annex the world. The Vostroyan regiment heroically sacrificed themselves to a man defending the factory city of Polia. Inspired by the Vostroyans' sacrifice, the populace refuse to submit to the Tau Empire. Reformed after their destruction on Nimbosa, the 9th Vostroyan once again met their ultimate fate during the Fall of Karak Prime in 998.M41. They held the hive city for 18 months against the brutal onslaught of a splinter fleet of Hive Fleet Moloch, valiantly facing a Tyranid swarm that stretched from the base of the city's walls to the distant horizon. With the onset of midwinter, and with the rapid depletion of ammunition and supplies, the 9th Vostroyan knew that they were doomed and vowed to sell their lives dearly. Only when the bulk of the Tyranid swarm had passed into the city did the regiment detonate its nucleonic stack, incinerating the hive, its defenders and an estimated 85% of the Tyranid swarm. With the coming of midwinter, the few surviving Tyranid organisms eventually starved to death and the splinter fleet was entirely defeated.11th Vostroyan Firstborn Regiment - The 11th Vostroyan Regiment served under Lord Marshal Graf Harazahn, supreme commander of the Imperial forces on Medusa V during the Fall of Medusa V campaign.16th Vostroyan Firstborn Regiment - The 16th Vostroyan Regiment helped defend the world of Nimbosa from another attempt by the Tau to conquer it before the Imperial Nimbosa Crusade liberated the world in 992.M41.22nd Vostroyan Firstborn Regiment - The 22nd Vostroyan Regiment was instrumental in the liberation of the world of Kurkaris. They are notable for being one of the very few Vostroyan Regiments to make use of Rough Riders mounted cavalry squadrons (called Hussars by the Vostroyans) in order to better engage the Orks in Kurkaris' thick forests.55th Vostroyan Firstborn Regiment - The 55th Vostroyan Firstborn Regiment can trace its history back to the reconstruction of the Imperium after the Horus Heresy. Generations of Vostroyan men have served in the 55th and fought, bled, and died on countless worlds across the galaxy. It is an old saying amongst their number that Vostroyan blood has been shed on every world in the Imperium, and given the illustrious history of even this one Firstborn regiment, this may not be too far from the truth.68th Vostroyan Firstborn Regiment - The 68th Vostroyan Regiment defended Danik's World from a massive Ork invasion and a planet-wide rebellion. Last known Imperial records of the regiment indicated that it had dropped to a strength of around 30 effective soldiers, all from the 5th Company. The bulk of the regiment was destroyed by the rebellious forces, both through sedition and ambush tactics. The 5th Company, which had previously been attached as a rearguard, suffered severely in their valiant attempt to make it back to Imperial lines. The commander of the 5th Company, Captain Gregorious Sebastev, was officially placed in command of the hardened survivors, shortly before the whole group was seconded to the Inquisition. The eventual fate of these survivors, and therefore the regiment itself, is currently unknown.241st Vostroyan Firstborn Regiment - Nicknamed the "Legia Zaimprowizowany" or "Improvised Regiment," the 241st Vostroyan Regiment is famous for its troops' ad hoc organisation. They are well-known for adopting the fighting style of other regiments as the circumstances dictate. The commander of the regiment when it participated in the Fall of Medusa V campaign was Colonel Illyich Szradislav.24th Vostroyan Heavy Armoured Regiment, "Iron Bloods" - The 24th Vostroyan Heavy Armoured Regiment consisted of less than 1,500 Guardsmen at its founding-strength.