This is the 11019th most frequent Korean word.
급습한다
"급습한다" means "to raid or attack suddenly."
In this sentence, '급습했다' (past tense form of '급습한다') describes a sudden attack or raid performed by the army on the enemy's base.
그 군대는 적의 기지를 급습했다.
The army raided the enemy's base.
Here, '급습할' (modifying form of '급습한다') metaphorically refers to tackling or addressing something quickly or suddenly, demonstrating flexibility in usage.
그는 시험 준비 중 먼저 급습할 내용을 정했다.
He decided on the topics to tackle first while preparing for the test.
This usage of '급습하여' (conjugated form connecting '급습한다') shows the literal action of raiding or sudden invasion causing disruption.