YOU SAID:
I rode a dragon into battle
INTO JAPANESE
ドラゴンに乗って戦いに出た
BACK INTO ENGLISH
rode a dragon into battle
INTO JAPANESE
ドラゴンに乗って戦った
BACK INTO ENGLISH
fought on a dragon
INTO JAPANESE
ドラゴンと戦った
BACK INTO ENGLISH
fought a dragon
INTO JAPANESE
ドラゴンと戦った
BACK INTO ENGLISH
fought a dragon
That didn't even make that much sense in English.