DMZ aceldama advance guard airhead avant-garde battle line battle site battlefield battleground beachhead bridgehead combat area combat zone enemy line farthest outpost field field of battle field of blood firing line first line forefront front front rank front-runner killing ground landing beach line line of battle outguard outpost pioneer point precursor railhead scout seat of war shambles spearhead the front theater theater of operations theater of war van vanguard zone of communications