YOU SAID:

The cats were fighting in the ally.

INTO JAPANESE

猫は、味方で戦っていた。

BACK INTO ENGLISH

Cats were fighting on the side.

INTO JAPANESE

猫は側で戦っていた。

BACK INTO ENGLISH

The cat was fighting by the side.

INTO JAPANESE

猫は側で戦っていた。

BACK INTO ENGLISH

The cat was fighting by the side.