Miss start of TB

If they join a guild after a Territory Battles event starts then they are locked out for the entire Territory Battles event.

If someone joins your guild after TB starts then they locked out for the entire TB. Anyone already in your guild can join any phase, regardless if they participated in the previous phase.

Thanks guys, wasn't sure if they were locked out of a phase, or the entire thing. Gotta move quick then.

If you miss it as in forget to deploy, then yeah, you can deploy in the subsequent phases.