stand sentinel

Verb

of soldiers broadly figuratively

(of soldiers) To keep watch. / (figuratively, by extension) To be in line like soldiers.

Japanese Meaning

見張る、監視を行う（警戒して周囲の状況を把握する） / 哨戒する、守備のために待機する / （比喩的に）兵士のように整然と並んでいる

At dusk the soldiers were ordered to stand sentinel along the fortress walls.

夕暮れに兵士たちは要塞の壁に沿って見張りを命じられた。

Sense（1）

(of soldiers) To keep watch.

Sense（2）

(figuratively, by extension) To be in line like soldiers.