Imperial Fists: No records of their losses in the Siege. Cannot conclude their strengthLeon Declis said:(Ineffective means they were no longer Legion strength; about 3000 warriors or less)TimeLord said:Apparently. You know, none of those other 8 Legions did anything at all while the Ultramarines were being trolled by the Alpha Legion playing the best game of hide and seek on the Eastern side of the Galaxy...The Ultramarines are considered one of the strongest and most honoured of all the Space Marine Chapters in the Imperium of Man, and were responsible for almost single-handedly holding the Imperium together after the Horus Heresy.
The Imperial Fists were effective damaged defending the Imperial Palace, ran off and hunted the Iron Warriors, until brought to ineffectiveness.
The Raven Guard were effectively made ineffective after Istvaan and mutation problems.
The Iron Hands were still ineffective after Istvaan.
The Salamanders were still ineffective after Istvaan.
The Blood Angels were made ineffective defending the Palace
The Dark Angels were sorting out Caliban in a Legion Civil War.
The White Scars were made ineffective defending the Palace.
The Space Wolves were missing from the Seige of Terra, but they only made 2 successor Chapters (the Wolf Brothers) so they were made ineffective.
Raven Guard: "Ineffective" is a word I would not use to describe a Legion based primarily on sneaky tactics, sabotage and subterfuge where they can cripple targets much bigger than themselves with their own unique tactics. Also their mutation problems were only limited to the gene experiments, not the surviving marines.
Salamanders: While crippled, they still had their Primarch to hold them together so their "ineffectiveness" I would put into question.
Iron Hands: Agreed
Blood Angels: No records of their losses in the Siege. Cannot conclude their strength.
Dark Angels: While you are right, still no records of how long this took or their participation in the post-war effort. It is known that they arrived at Terra after the final battle but would have stuck around for a while to help out before returning to Caliban I would have thought.
White Scars: No recorded of their losses in the Siege. Cannot conclude their strength.
Space Wolves: "The Space Wolves were missing from the Seige of Terra, but they only made 2 successor Chapters (the Wolf Brothers) so they were made ineffective."
Their lack of successor chapters means nothing. Multiple first founding chapters still operate outside the Codex Astartes' guidelines for Chapter strength like the Dark Angels.
Leman Russ stood by the Imperial Fists when initially rejecting the Codex post-war so it could be possible that they hide their real numbers.
Their numbers post-Calth are unknown to my knowledge, but if you take into account that Horus ordered the full co-operation of Logar and Guilliman in purging the "Ork threat" then we can conclude that about 90% of their Legion was on or orbiting Calth at the time Logar's betrayal was made obvious. Even just reading 'Know No Fear' you get a feeling for how utterly pounded into the ground the Ultramarines were before they regrouped.The only Legion still at Legion strength (note: over 100,000 Marines, more than the others combined at that point), the Ultramarines were the ones who actually had the numbers to keep everything together, and Guilliman, the statesman, was the only Primarch who could handle the facts of war and the politics of the newly arisen Imperium and it's High Lords of Terra.
In my view, the other 8 Legions were the ones who defeated Horus and it was the Ultramarines who kept everything together afterwards.
Also they were conspiring to create a second Imperium without even knowing if the Emperor had even fallen yet! Paragon of righteousness right there. He didn't even want to rule the Imperium Secundus, but with the death of Sanguinius he wouldn't choose anyone else. Not sure what that shows for his trust for his surviving brothers who fought for the defense of Terra and the Imperium while he was off sitting in his corner of the galaxy plotting against his father.
To quote a friend of mine [user]Scorched_Cascade[/user]
"Except, you know, Battle of the Abyss, Battle of Calth/Calth getting buttfucked while they were at muster, near pandemic Alpha Legion infiltration, being lead away on a wild goose chase by the Alpha Legion, plotting sedition, arriving after the greatest and most decisive battle in the heresy was already finished, almost causing a second civil war in the ruined Imperium because of how undiplomatic he was and being almost single handedly responsible for the levels of pants on head retarded that the modern Imperium is (Codex Astartes, High Lords of Terra, reorganisation of the Imperium)"