Foxhole

Foxhole is a massively multiplayer game where thousands of players shape the outcome of a persistent online war that lasts for weeks. Players ARE the content in this sandbox war game. Every individual soldier is a player that contributes to the war effort through logistics, base building, reconnaissance, combat, and more.
Massively Multiplayer Warfare: Thousands of players connect to the same world and fight in a persistent war that lasts for weeks. Immerse yourself in a sandbox that includes hundreds of hand crafted towns, villages, and other areas of interest.
Logistics: Comprehensive logistics game where every bullet, weapon, vehicle, and drop of fuel is produced and supplied by real players. Win battles by cutting off supply lines or sabotaging infrastructure behind enemy lines.
Trench Networks: Fortify your front line with trench lines and bunker networks. Build underground bases with ammunition storage, engine rooms, intelligence centers, and artillery emplacements.
Weather System: A fully dynamic weather system that simulates snow and rain storms. Weather can have a profound impact on the battlefield, freezing over rivers, disabling equipment, and limiting artillery effectiveness.
No Man’s Land: Unleash devastating artillery bombardments that can permanently level towns and transform landscapes into a desolate no man's land.
Tank Combat - Dozens of tank classes and variants supporting tank crews with gunner, commander, and engineer roles. Tanks can be tracked, have their fuel tanks ruptured, or be disabled and feature an armor system with penetration and deflection mechanics.
Naval Warfare: Construct impressive fleets of Battleships, Destroyers, and Submarines. Launch massive beach invasions to claim territory on distant shores.
Train System: Players can design and build large scale railway systems, enabling supplies, vehicles, and other equipment to be hauled over long distances across the persistent world.
Facilities:  Construct and manage industrial bases that can be developed into mass production centers or shipping ports servicing hundreds of logistics players every day.
The developers describe the content like this: The game is set in a world war 2 inspired world. Players in the game will kill other players in the context of a battle. Players will use a variety of firearms or vehicles to kill other player controlled soldiers in such battles.