This is the 4314th most frequent Korean word.
침공은
"침공은" means "invasion is."
The word '침공은' here is used to indicate the invasion being the subject of the sentence.
그의 침공은 역사를 바꾸었다.
His invasion changed history.
In this sentence, '침공은' emphasizes the abrupt nature of the invasion as the main topic.
침공은 예고 없이 시작되었다.
The invasion began without warning.
Here, '침공은' is noted as a key event leading to a significant series of occurrences.