We know that throughout recent history, Jews were conscripted into non-Jewish armies. Are Jews allowed to join those armies or at the very least are they allowed to fight in those armies battles - given the chance that the opposing army also has Jews in it?
Ex: In WWI Russia and Germany both had Jews in their armies. Should the Jews on both sides refuse to fight lest they kill the Jews on the other side?
What if the punishment for not fighting is (1) jail time (2) getting brutally beat up (3) personal death (4) community will be pogrummed?
Do you know any מראה מקומות on this topic?