The FlagWar plugin has been updated for the survival server so that only two players of a town need to be online in order to declare a war. If you don’t have two people in your town (it’s just you) then you’ll need to grow your town before going on the offensive.

https://aedi.app/support/survival/

If you’re unfamiliar with FlagWar, you can read more about it on the page I linked. It allows people to “capture” other people’s land. The only thing on this page that’s inaccurate is that a one-player town can now defend itself but will be unable to start a war. The war flag is an oak fence.

I expect this Towny plugin to provide recourse for players against claims that are abusive or designed to “encircle” other towns.