1) Adversary 2) An armed adversary 3) An enemy in war 4) Antagonist 5) Enemy 6) Enemy in war 7) Enemy, old style 8) Opponent 9) Opposer 10) Opposition 11) Resister Found on https://www.crosswordclues.com/clue/foeman
Foe'man (fō'm a n) noun ; plural Foemen (-m e n). [ Anglo-Saxon fāhman .] An enemy in war. « And the stern joy which warriors feel In foemen worthy of their steel.» Sir W. Scott Found on http://www.encyclo.co.uk/webster/F/52