The Battle Grounds is the only revolutionary war mod for Half-Life 1 and 2. The action developes around the american colonies that just declared their independence and the british empire trying to maintain influence and tea taxes. The war for independence is reanacted by players around the world, in The Battle Grounds.

Nightwatch is a single player modification for Half-Life 1. You are placed into the shoes of Sergeant William Archer, a high-clearance military security officer just about to go off-duty when everything starts to go horribly wrong. The story of Nightwatch runs parallel to that of Half-Life itself, and at some points does overlap with the other facets of the Half-Life timeline.