Umm, would it be a war without fighting? Of course PvP is enabled!
Yea, you must find an enemy who is willing to fight. Each town would then wait precisely one week to let residents prepare.
Are your items and things you placed not safe? Wouldn't that ruin the point of towns?
~ @WhoNeedsJimbo
No, during wars, enemies could switch. Just to clarify, I do not feel explosions should be on at any part of a war. The point of towns is not to protect everything, but to build, to create an empire. Towny wars are an expression of showing your empire's superiority. It provides a playing field for people to show they're stronger, not just have more residents. It's meant to be exciting. If you have ever gone raiding in factions, and actively fought off the enemy there with your team, it is an absolute blast.
If the last one stands true, I have a feeling it could potentionally ruin stuff like chestshops, grinders , and many other things.
~ @WhoNeedsJimbo
That's why not every town would be forced to become some kind of army base. Don't want to fights? Just stay neutral!