Lord of the Rings: Conquest is a similar idea. You play as the infantry (or a Hero, depending on the mode) and you fight huge battles such as this one.
It's similar to Star wars Battlefront 2
It's pretty old though, came out in 2009
Well... the Just Cause 2 engine with the community multiplayer mod can support over 1300 players on one server.
Here's a beta test with more than 600 players:
https://youtu.be/gYoI13P3Gfs
That same team is working on the mod for JC3 now.
It CAN be done.
Planetside 2 (an MMO FPS) beat a world record a whIle ago 1158 players on the same map in one battle and still regularly has about a 1000 players on 1 server (with the large majority on one map and few on another if they choose) most of of the time. And it came out in 2012. The gameplay can be incomparable. Check this out: https://m.youtube.com/watch?v=gTz4SIiRerI
Planestide 2 is also fucking INSANE if you get in a good squad. Its been a long time since i played though, last time was when they added the swamp continent.
They've added a lot sonce then, there's a player construction system now. Some people call it an MMORTSFPS when u get in a good platoon. The zerg platoons do suck tho
It's similar to Star wars Battlefront 2
It's pretty old though, came out in 2009
Here's a beta test with more than 600 players:
https://youtu.be/gYoI13P3Gfs
That same team is working on the mod for JC3 now.
It CAN be done.
Check out planetside 2