This is footage from the open Pre-Alpha test of Anvil Empires on 4/19/23. It features battles and a siege between Remnants (us) and the Ancient faction.
The Anvil Empires Pre-Alpha is a very early demo containing a small subset of foundational features. It is a bare bones build designed as scaffolding for Siege Camp (developers) to develop more comprehensive features in the foreseeable future. The best way to look at the Pre-Alpha is to see it as a platform for development rather than a complete game experience.