I hate to say this as an irish person but in Total War I find it very hard to kill British people. I identify with them more than the other nations obviously and most of my friends are British. When I see the British lines closing in on my french lines and hear them talking " oh lord this is it! " I start to feel like i shouldn't be killing them and it really adds a human touch to the game which I like a lot. Also I know that 1/3 of the Brit army is in some way irish so I guess that would also add to my dislike in killing British people in the game.