Most of us have been avoiding the painful conversations with friends and family over Gaza. Why? It seems like we have no common frame of reference, and so it hardly seems worth it. In this Rosh Hashanah sermon, I do something a little bizarre: I use Judaism's main halakhic code about war -- Maimonides' codification of all the Torah's statements on war-- to illuminate the war we are at with ourselves. My hope is that it opens us all up a little to each other.