I just saw a spoiler on weibo abt the older brother
He was sent to the military by their mother when she found out he has feelings for bai ju. Brah why did they have to include the incest plot. I was praying they wouldn't go in that direction when i noticed the subtle jealous look when he was reading her letter and she mentioned yun fei.
Because they had guns and they wouldn't be able to fight back ig since they were outnumbered.
Yh both sides have guns but they are outnumbered with an injured member plus the quality in guns is huge. Also bai ju is the only police officer there.