YOU SAID:
You don't have to fight my battles.
INTO JAPANESE
あなたは私の戦いを戦う必要はありません。
BACK INTO ENGLISH
You don't have to fight my fight.
INTO JAPANESE
あなたは私の戦いを戦う必要はありません。
BACK INTO ENGLISH
You don't have to fight my fight.
That didn't even make that much sense in English.