To arms meant back then so it meant alert alert something terrible was coming to town.
It means Justice & Military honor.
It could just be a friendly thing, or it could be because she likes you. I wouldn't ask her unless she shows other signs though.
it means it could be the start of something good
Literally, it's a fellow soldier Figuratively, it means someone who has shared a difficult, dangerous or stressful experienceIt can also be two soldiers that protect each other in a war