Rebels said a column of vehicles tried to punch out of an encirclement at dawn.
From the telegraph.co.uk
The surprise encirclement put a devastating blow to the morale of the Cossacks.
From the en.wikipedia.org
Hong Chengchou tried to break the encirclement for many times, yet always failed.
From the en.wikipedia.org
The remnants of Burma Army broke out to the north, narrowly escaping encirclement.
From the en.wikipedia.org
Russian hard-liners see the southern-rim thrust as a strategy of U.S. encirclement.
From the businessweek.com
The encirclement parent of A is the highest peak that is inside this other contour.
From the en.wikipedia.org
Budapest's defenders asked permission to leave the city and escape the encirclement.
From the en.wikipedia.org
Menaced with encirclement, Ambert had to retreat and rejoined Hoche's center column.
From the en.wikipedia.org
The mere threat of encirclement, the army claims, frightened militants out of Mingora.
From the economist.com
More examples
Blockade: a war measure that isolates some area of importance to the enemy
Encirclement is a military term for the situation when a force or target is isolated and surrounded by enemy forces.
The loss of freedom of maneuver to one force resulting from an enemy force's control of all routes of egress and reinforcement. (See also breakout and linkup.) See FMs 6-20, 7-20, 7-30, 17-95, 71-100, 71-123, and 100-5.
An operation where one force loses it freedom of maneuver because an opposing force is able to isolate it by controlling all ground lines of communication (FM 3-0)