YOU SAID:
Let us sword fight now
INTO JAPANESE
剣で戦いましょう
BACK INTO ENGLISH
Let's fight with the sword
INTO JAPANESE
剣で戦おう
BACK INTO ENGLISH
Fight with the sword
INTO JAPANESE
剣で戦う
BACK INTO ENGLISH
Fight with sword
INTO JAPANESE
剣で戦う
BACK INTO ENGLISH
Fight with sword
That didn't even make that much sense in English.