a sudden attack or raid taken by surprise; an unexpected assault or strike.
夜明け前に敵陣へ急襲をかけた。
They launched a surprise raid on the enemy camp before dawn.
警察は麻薬取引現場に急襲し、数人を逮捕した。
The police raided the drug-dealing site and arrested several people.
海賊が商船を急襲して物資を奪った。
Pirates suddenly attacked the merchant ship and seized supplies.