を守った

protected; defended, kept; followed; observed (a promise, rule, or other commitment)

→ を
phrase Rare #29,214
protected; defended Past form of 守る, used when someone or something prevented danger or attack and kept the object safe or intact.
JA: その犬は見知らぬ人からその家を守った。
EN: That dog protected the house from strangers.

彼らは祖国を守った。

They defended their homeland.

あの子たちはバカどもからラピュタを守ったんだよ

Those kids protected Laputa from those idiots.

— 天空の城ラピュタ (1986)

ヤニーは命をかけてサクラを守った。

Yanny risked his life to protect Sakura.

周囲の丘がその町を守った。

The surrounding hills protected the town.

あの子は谷を守ったのじゃ

That child protected the valley.

— 風の谷のナウシカ (1984)

phrase Rare #43,681
kept; followed; observed (a promise, rule, or other commitment) Past form of 守る. Used when someone does not break or go against something they are expected to keep.
JA: 彼は約束を守った。
EN: He kept his promise.

トムは一度も時間を守ったことがない。

Tom has never been punctual.

その国は同盟国に対する忠誠を守った。

The country remained loyal to its allies.

君が秘密を守ったのは賢明だ。

It was wise of you to keep the secret.

そして誓いを守った

And he kept his vow.

— キャッチ・ミー・イフ・ユー・キャン (2002)