Badab War
The Badab War was a major rebellion in the Imperium's history, lead by Lufgt Huron and the Astral Claws. He first conquered the Badab Sector and decided he should rule all of it, like the Ultramarines ruling Ultramar. Then Imperial forces demanded the tithes. He refused. And three other chapters were honorbound to fight with him. And such began the most bloody rebellion in the 41st Millenium. And also the most famous appearances of a shitton of minor chapters that most people haven't heard of, who will probably never appear outside a few novels and the Imperial Armor books. Pretty unique among wars in that it almost all fights were between Space Marines, with little Guardsmen (traitor or otherwise) in sight.
TRAITOR FORCES
- Astral Claws (Fell to Chaos after they lost and became the Red Corsairs)
- Mantis Warriors
- Lamenters (Figures that they'd join the losing side)
- Executioners
LOYALIST FORCES
- Fire Hawks (Before they became the Legion of the Damned)
- Marines Errant
- Carcharadons/Space Sharks (Lead by Tyberos the Red Wake, only known wielder of LIGHTNING CHAINCLAWS)
- Red Scorpions (Led by Verant Ortys and then Carab Culln)
- Exorcists
- Salamanders (The only Chapter in the war that most people would recognise)
- Fire Angels
- Raptors
- Minotaurs (Personal favourites of the High Lords of Terra. Their Chapter Master publicly insulted Marneus Calgar, which makes them awesome.)
- Sons of Medusa
- Howling Griffons
- Novamarines