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の大群

a swarm of

→ の
phrase Rare #40,432
a swarm of 大群 means a large group or swarm; の links it to the animal or thing that makes up the group.
JA: 空に鳥の大群が見えた。
EN: I saw a flock of birds in the sky.

トムはミツバチの大群に襲われました。

Tom was attacked by a swarm of bees.

ものすごいカラスの大群だ

That's an enormous flock of crows.

— デッド・ドント・ダイ (2019)

ネズミの大群もあった

There were also hordes of rats.

— Good Luck, Have Fun, Don't Die (2026)

私たち、蜂の大群に襲われたんです。

We were attacked by a swarm of bees.