The Unification War was a 50 year conflict between the three factions whose territories would eventually make up the Kingdom of Gilboa. One of the factions came under the control of soldier Silas Benjamin, who ended the war by uniting the factions under one flag. The country Gath had some role in the war, as their Port Prosperity would become part of the new nation.

The war had numerous casualties, including David Shepherd's father.