This is the 4125th most frequent Korean word.
전쟁의
"Of war" or "war's."
The word '전쟁의' here is used to modify '참상' (horrors), indicating that the horrors are related to '전쟁' (war).
전쟁의 참상은 우리에게 큰 교훈을 준다.
The horrors of war teach us a great lesson.
In this sentence, '전쟁의' describes '중요성' (importance), attributing the 'importance' specifically to '전쟁' (war).
역사책에서 전쟁의 중요성을 배웠어요.
I learned about the importance of war from the history book.
Here, '전쟁의' is used to specify '원인과 결과' (causes and outcomes) as belonging to or originating from '전쟁' (war).