The Battles of Khalkhin Gol, known in Japan as the Nomonhan Incident after Nomonhan Burd Obo, were the decisive engagements of the undeclared Soviet–Japanese border conflicts which involved the Soviet Union, Mongolia, Japan, and Manchukuo in 1939. The conflict is named after the river Khalkhin Gol, which passes through the battlefield. The Soviet offensive, led by general Georgy Zhukov, utilized airplanes, tanks, and infantry in a simultaneous three-pronged offensive, the first of its kind in modern warfare. Similar tactics were later used during Operation Uranus at the Battle of Stalingrad.