Sentence

勝てば官軍。

()てば官軍(かんぐん)
All is fair in love and war.
Sentence

勝てば官軍負ければ賊軍。

()てば官軍(かんぐん)()ければ賊軍(ぞくぐん)
If you win, you are in the right, but if you lose, you are in the wrong.
Sentence

官軍に入城を許すとはどういう了見だ。

官軍(かんぐん)入城(にゅうじょう)(ゆる)すとはどういう了見(りょうけん)だ。
What do you think you're doing letting the loyalists into the castle?