First published in Strategy & Tactics magazine #51, later published in other editions, and is a small (100 counter) representation of World War I.
From the rules:
World War I is a simulation on the army level of the land combat in Europe from 1914 to 1918. the simulation is primarily a land conflict with the secondary influence of naval forces abstractly simulated. The game covers five years in semi-annual (six-month) turns.