a position held or to be gained on the enemy side of a river, defile, or other obstacle, to cover the crossing of friendly troops.
any position gained that can be used as a foothold for further advancement; beachhead.
a defensive work covering or protecting the end of a
toward the enemy.
an area of ground secured or to be taken on the enemy's side of an obstacle, esp a defended river
a fortified or defensive position at the end of a bridge nearest to the enemy
an advantageous position gained for future expansion
Collins English Dictionary - Complete & Unabridged 10th Edition
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