Abstract: This article addresses Frances Kamm's discussion, in Ethics for Enemies, of how intentions should figure in determining whether a nation's act of war is morally permissible. The authors, experts in law rather than moral philosophy, seek to show how certain facets of domestic and international law might pose challenges to Kamm’s argument. They first consider how domestic law addresses individual behavioral analogs to the kind of state behavior with which Kamm is concerned. They then turn to state behavior and the law of war, addressing how the legality of conduct indicates the conduct's moral permissibility.