彼の勇気に

at his courage

→ 彼
phrase Rare #25,672
at his courage 彼の勇気 means “his courage,” and に marks it as the target of admiration, amazement, or another emotional reaction. This phrase is usually followed by a verb such as 感心する or 驚嘆する.
JA: みんな彼の勇気に感動した。
EN: Everyone was moved by his courage.

私は彼の勇気に驚嘆した

I marveled at his courage.

彼の勇気に感動した

I was moved by his courage.

彼の勇気に感心せずにはいられなかった

I couldn't help but admire his courage.

誰もが彼の勇気に感嘆した

Everyone admired his courage.

彼の勇気にびっくりした

I was amazed by his courage.

私たちは彼の勇気にとても感心した

We were deeply impressed by his courage.

彼の勇気に感心して私は彼を信頼した

Impressed by his courage, I trusted him.

子供の溺れるところを救った彼の勇気に賞賛の言葉もない

His courage in saving a drowning child is beyond praise.