YOU SAID:

You could never tell a major battle happened here!

INTO JAPANESE

ここで大規模な戦闘が起こったとは到底思えません。

BACK INTO ENGLISH

I can't believe that a large-scale battle took place here.

INTO JAPANESE

ここで大規模な戦闘が行われたとは信じられない。

BACK INTO ENGLISH

It is hard to believe that a large-scale battle took place here.

INTO JAPANESE

ここで大規模な戦闘が起こったとは信じがたい。

BACK INTO ENGLISH

It is hard to believe that a large-scale battle took place here.