In my Julii campaign I just attacked a rebel army of one peasant unit with one War Dog unit of mine (for a laugh really)...

Battle was a strangly close run thing as the peasants managed to kill all the dog while only taking about 30% casualties and not routing...

I charged in the handlers and they routed the peasants and finished them off... (this is Medium battlemap difficulty by the way...)

Anyway the funny thing is I got to adopt the my Captain after that battle.... Not a bad step up in the world for a former dog handler, I have a mind to make him the faction heir....