High Quality Content by WIKIPEDIA articles! WW1 Source is a Half-Life 2 total conversion modification utilizing Valve Corporation`s Source Engine. It is claimed to be the only World War I modification for Source, with a combined effort of three original teams: In Flanders Field Team, The Trenches 2 Team and the Field of Horror Team. WW1 Source has been featured in an article on an April, 2010 edition of PC Gamer UK. It has also received a spot in the top 100 mods during Mod DB`s Mod of The Year 2010 and 2011.