YOU SAID:
"We've invaded china," said the mongols
INTO JAPANESE
「我々 は中国を侵略した」モンゴル人は言った
BACK INTO ENGLISH
Mongolian people who said "we had invaded China.
INTO JAPANESE
モンゴル人氏は「我々 は中国を侵略しました。 しました
That didn't even make that much sense in English.