User blog comment:Vivaporius/AT Idea: Imperial Civil War/@comment-3258762-20120410183424/@comment-4051689-20120410191836

They would still have their periodically common battle cries such as praise to their primarch and with-held traditional beliefs as with the terms before the horus heresy. Regarding however events of which to call the enemy, Heretic is the definition used to describe those that contridict with another individual belief and as such are considered befouled or in this case "heretics" (being the worship of the emperor and the chaos gods). the confusing aspects here is that during the crusade, while such words were never used much of the adeptus astartes still acted like the religous warrior monks we know them as of today, refering to similair individuals as "brother" and thus so perhaps already had a religous influence upon them previously, although the reason why has never so far as to be explained.

Getting back on subject, they can still use such accusations such as traitor or "renegade" as such words do not have to involve the contridiction of belief and thus can still be freely used. Although one can say that those accusations do not however deliever much of the religous punch as the former and thus it would be reasonable to creat such other cries that can match up to both the belief and the accusation. In Greek, the word "heretic" once actually meant "choice" or the chosen option that is considered definly wrong and it is there that perhaps the individual marines might still scream, as Legion put it DIE HERETIC! without any of the religous abstract although considering 40k, this might still further cause confusion.

REBEL SCUM!, or BETRAYER! are often cries we here in movies and books and could perhaps be used here, but somehow it would feel somewhat "non-original", if you get the meaning. Cry-wise, we could go for something that would perhaps harm the honour of the rebel chapter as such things could be still considered true to there beliefs, of which we could use perhaps a dozen cries that could stain the chapter, PERISH DOGS! is something thousand sons usually say to attempt to harm the honour of the space-wolves in which case similair cries could be issued to an extent, such as ''PUT THESE HOUNDS DOWN! or perhaps a bit more significtly reference to perhaps a chapters history and make use of an event such as, dark angel wise SHATTER THE FRACTURED AND BREAK THEM!'' referencing to the dark angel civil war on caliban that resulted in the fallen angels, although only a collected few out-side of the chapter know this an thus could join the E loyalists, personally harming a chapters pride.