Just a couple of lines to recommend a lecture on the question of proportionality in war by Professor Jeff McMahan of Rutgers University. It’s worth the full hour and twenty four minutes of your time but in case you need a couple of teasers to tempt you I’ll throw you these; he thinks that certain classes of Israeli and Palestinian civilians are not entitled to complain if they are harmed by enemy action and that the idea of proportionality in unjust wars makes no sense. I found the lecture here.