vicious enemy

(жорстокий) лютий противник (‘We were a twelve-man seek-and-destroy patrol, hunting a vicious and bloodthirsty enemy.’ - ‘Operation Mayhem’, Heaney with Lewis, 2014)

most vicious enemy

overwhelm an enemy / overwhelm the enemy

adversary (enemy)

carry the fight to the enemy

carry the war to the enemy

contact with the enemy

contain the enemy

customs of the enemy

cut behind the enemy

defeat an enemy

desertion in the face of the enemy

destroy the enemy

destroy the integrity of the enemy's defense

destruction of enemy manpower/personnel

drive the enemy from his pillbox

enemy nationals

enemy prisoner of war (EPW)

enemy weapon location report

enemy-held territory

engage the enemy

evade enemy patrols

exploit enemy’s weakness

fend off enemy's a advance

fix enemy units

foraging (on the enemy)

chase the enemy hotfoot

incursion into enemy territory