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烏の

crow's

→ 烏
phrase Rare #34,456
crow's の connects 烏 (crow) to a noun that follows, showing possession or association. 烏 is often written カラス.
JA: 烏の巣が木の上にある。
EN: A crow's nest is in the tree.

そこで烏の軍隊はもうすっかり安心してしまいました。

So the crow army felt completely at ease.