First look at Ace of Spades beta 0.26. It's like Minecraft in a WWI setting with a focus on team-based combat. It is online only and free to play.
Basically, there are two teams (Green vs Blue) and you have to steal your opponent's "intel" and return it to your base. You can destroy terrain and build structures.
Ace of Spades website:
http://ace-spades.com/
AoS Wiki:
http://www.aceofspadeswiki.com
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