Tactical team based fps Isonzo free weekend
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Save 67% on Isonzo on Steam
https://store.steampowered.com/app/1556790/Isonzo/
Ferocious Alpine warfare will test your tactical skills in this authentic WW1 FPS. Battle among the scenic peaks, rugged valleys and idyllic towns of northern Italy. The Great War on the Italian Front is brought to life and elevated to unexpected heights!
Only played it for an hour but it's pretty good so far, if you like this type of gameplay. Feels somewhere in between Hell Let Loose and Battlefield 1. Native Linux version.