圍點打援　

◎ 圍點打援 wéidiǎn-dǎyuán

[besiege the stronghold to annihilate the enemy relief force;encircle an enemy post and trounce reinforcements coming to its aid] 一種戰(zhàn)術(shù),抽出部分兵力圍困據(jù)點,然后使用主力部隊打擊救援據(jù)點的援軍