Overview
Trenches is a strategic World War I video game first developed for the iPhone and iPod Touch by American studio Thunder Game Works. The initial version launched on December 24, 2009.
Gameplay
Trenches is a combination of a Castle Attack and Tower Defense set during World War I. The player is put into the role of a Battlefield Commander for the British Expeditionary Forces in Western Europe during 1914 against the German Army, or vice versa, and the player must accomplish a set of missions to complete the game during the campaign. The game spans throughout the war as the game progresses, allowing the play to unlock more classes and artillery.
The player must allocate resources and hire units to combat enemies units advancing from the right side of the screen. Units include the Riflemen, Machinegunner, Sniper, Engineer, Mortar Team, and randomly spawned Officers that add aura-based benefits to allied units. Players also have access to off-screen artillery support that include High Explosive Bombardment and Poisonous Gas.
From Wikipedia (CC BY-SA 4.0).