てば官軍 かんぐん、負 ければ賊軍 ぞくぐん
kateba kangun makereba zokugun

Expression

1. might is right; history is written by the victors; winners are always right and losers are always in the wrong; if you win you are the loyalist army, if you lose you are the rebel army — literal

Proverb
Other forms: