My 8th of the 7, despite being based on the codex and BoED, is not like that at all. His philosophy can be summed up with: for my men. So any tactic: ambush, poison, misinformation, phsyops ect are all fair game. He will readily admit to fighting dirty because it is his duty as their commander to bring everyone home alive. It is impossible as he well knows but that does not mean he will not try. That said the corruption of himself or his men, or the taking of hostages will not be permitted by himself or by his men.