WordNet sense 1 (engaged in war):

belligerent, militant, warring, war-ridden

WordNet sense 2 (not peaceful):

unpeaceful

WordNet sense 3 (disposed to loud disagreements and fighting):

brawling

WordNet sense 4 (undisciplined and unruly):

disorderly

WordNet sense 5 (engaged in or ready for military or naval operations):

active, combat-ready

WordNet sense 6 (of or intended for or involved in military operations):

operational

WordNet sense 7 (the act of fighting; any contest or struggle):

combat, fight, scrap, combat