In addition to the overall siege and territory mechanics testing, this third PTR will try to organize a large-scale siege battle hosted by Star Vault. This siege is expected to run sometime between 1:00 p.m. and 2:00 p.m. EDT. This is the final public testing round before all of these features hit the game proper, so those who are looking to help out should get prepared.
Content retrieved from: https://massivelyop.com/2023/08/08/mortal-online-2-shuffles-its-third-territory-control-public-test-to-today-here-are-the-patch-notes/.