The Battles of Khalkhin-Gol, the first installment in Days of Wonder's second series of Memoir '44 Battle Maps, offers a campaign of six standard scenarios that can be enhanced with the two pre-printed Breakthrough battles provided in this expansion. In more detail, The Battles of Khalkhin-Gol is a series of battles fought along the Halha River (Khalkhin-Gol) on the Soviet-Japanese border at the very beginning of World War II. The Japanese Sixth Army was facing the Soviet 57th Special Corps, including Mongolian cavalry. At first, the battles were only short skirmishes, but it soon escalated into open war. The whole campaign lasted five months and ended with a Soviet victory. The six standard scenarios of this expansion can be played separately or as a campaign, with each scenario outcome impacting the following one. The pre-printed Breakthrough scenarios - Bain Tsagan Heights and Tightening the Noose - can be played in the campaign as well as one of the two Overlord scenarios, Encirclement at Khalkhin-Gol.