Description
The Shelling of Mainila, or the Mainila incident, was a military incident on 26 November 1939 in which the Soviet Union's Red Army shelled the Soviet border village of Mainila near Beloostrov. The Soviet Union declared that the fire originated from Finland across the nearby border and claimed to have had losses in personnel. Through that false flag operation, the Soviet Union gained a great propaganda boost and a casus belli for launching the Winter War four days later.