Fire Coup

Blazepaw had always been an angry and brooding she-cat, having the goal of killing her sister, Moonpaw, for reasons unknown and eventually take over MarshClan as leader. Her apprenticeship was assigned to Burnrunner — a seemingly kind and gentle she-cat, who would hopefully be able to mellow out her apprentice throughout her training. Burnrunner, however, wasn’t what she seemed. Her sweet nature, although convincing, was really just a front for a hateful, bitter, and uncaring cat. When she realized what her apprentice’s goal was, she supported her plans, but she decided to take it further — why take over only one Clan when you could take over all three?
When Moonpaw went missing, Blazepaw took it as a victory for herself. Her and her brother Blackpaw earned their warrior names — Blazeclaw and Blacklight.  Unfortunately for Blazeclaw, Moonpaw had found her way back to the Clan a few seasons after, which was something that irritated her terribly, but her presence wasn't anything that hadn't already been a part of their plans.
Burnrunner had begun to search for a mate so that she could raise kits into their cause. After a long while of flirting and pseudo-courting, she found herself not one, but two mates: Dapplespots of WaveClan and Lynxstep of MarshClan, and not long after that she was expecting kits that revealed themselves (to her, at least) to be Dapplespots' — Scorchkit, Weedkit, and Beekit.  Blazeclaw started to flirt and develop feelings for a tom named Rumbleheart, falling pregnant with his kits not long after the plague.  Burnrunner herself started expecting her second litter soon after the illness left the Clans, giving birth to two of Lynxstep's kits — Swampkit and Swipekit. Two moons later, Blazeclaw's kits were born: Shadowkit, Clawkit, Tigerkit, and Crashkit.
Once Blazeclaw's kits were apprenticed, they took action. Blazeclaw, Beewing, Swipepaw, Shadowpaw, Clawpaw, Tigerpaw, and Crashpaw stayed behind to secure camp, while Scorchstorm, Weedthorn, and Swamppaw were assigned to a border patrol with Reedstar, Scarletflower, and Thornstrike to investigate suspicious activity there with Burnrunner following after them. In the fight, Burnrunner managed to take Reedstar's last life, and in turn she was killed by Scarletflower, who was taken prisoner. Weedthorn, expecting Shalestone's kits, ran off during the fight to unclaimed territory.
Blazeclaw ruled over MarshClan as Blazestar, naming Scorchstorm her deputy. With her disregard for the Warrior Code, Scorchstorm not having had an apprentice wasn't an issue for her. During her reign, she held the medicine cats and kits hostage to keep everyone else in line. Due to her disbelief in StarClan, though, she took one of the medicine cats, Silverstream, to the Tidefalls under the guise of receiving her nine lives. Once she got there, she killed Silverstream and buried her there as an insult to the warrior ancestors. She also named Burnrunner's second litter and her own warriors, even though none of them were old enough for the rank.
The cats who started the movement to get MarshClan back under proper leadership were Ravenheart and Dewsong.  When Dewsong became pregnant during Blazestar's reign, they started to find cats to rebel with them.  At the next Gathering, Claywillow and Fishbrair both talked with cats from the other two Clans to tell them when they were attacking and ask them for aid, and they complied.  
WaveClan sent Bluesky, Forestflight, Larkwing, Brownfeather, Fishblaze, Murrespot, and Floundertail to fight.  MeadowClan did not organize an official patrol, but cats who volunteered to go fight (a list of cats comprising of Poppyblaze, Moonclaw, Acornbreeze, Flurrysong, and Harenose) had Sedgestar's blessing to do so.  Paired with the refugees who had fled to their Clans (Bearheart, Willowfern, and Windfall in WaveClan and Woolflower, Duststorm, Hopfeather, and Berrylight in MeadowClan), all these cats journeyed to MarshClan's camp to help usurp Blazestar and her followers.
During the fight, Scorchstorm killed queens Hollyblossom and Feathersong, while Clawsplash was sent after one of Hollyblossom's kits, Flurrykit, and gave her injuries that led to her eventual death.  Later, due to injuries she gained during a fight with Beewing, Cherryfall died in childbirth, along with one of her kits being stillborn.  Scarletflower defeated Blazestar and exiled her followers.
In the aftermath, Scarletflower left to gain her nine lives. Woolflower left MarshClan to live in MeadowClan, wanting to e with the tom he loved, Acornbreeze. Similarly, Fishblaze left WaveClan to live in MarshClan with his new mate, Bearheart.