A place of confrontation.
A barrier constructed across a road, especially as a military defence
An obstacle, barrier, or bulwark.
to close or block a road etc., using a barricade
to keep someone in (or out), using a blockade, especially ships in a port
The waging of war or armed conflict against an enemy.
Military operations of some particular kind e.g. guerrilla warfare.
To lead a military life; to carry on continual wars.