YOU SAID:

knives are used to kill knights during the night

INTO JAPANESE

ナイフは夜間に騎士を殺すのに使われます

BACK INTO ENGLISH

A knife is used to kill a knight at night

INTO JAPANESE

ナイフは夜に騎士を殺すために使われます

BACK INTO ENGLISH

A knife is used to kill a knight at night