EPIC Battle at Otto and Sherrick Farm - War of Rights (400 players) 

This game is absolutely brilliant, expect to see a lot more of this in the future.
If you like what you see please consider subscribing
Game Description
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War of Rights is a first person multiplayer game featuring massive 300 player battles with a focus on historical authenticity, teamplay and immersion. It is set during the perilous days of the American Civil War, in the Maryland Campaign of September, 1862.