It is well established that during the Dalek history, that they have had various civil wars. I don't think this has ever been explored in the TV series, but is anyone aware of sources involving different factions of the Cybermen engaging in a civil war?
1 Answer
No.
I've read through the entirety of https://tardis.fandom.com/wiki/Cyberman#History, and at no point in any officially-licensed media have two factions of Cybermen fought against each other.
Whenever two separate groups meet, it seems they always willingly join together.
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1@jim the book Killing Ground apparently. It's also implied in the TV series that the Cybus Cybermen merged with the "regular" Cybermen. Sep 21 at 15:42