on its right flank and the III Army Corps, on its left flank. The IV Army Corps was located north of Lake Ladoga. It was composed of two divisions under Juho Heiskanen, who was soon replaced by Woldemar Hägglund. The North Finland Group was a collection of White Guards, border guards and drafted reservist units under Wiljo Tuompo. Soviet invasion Start of invasion and political operations On 30 November 1939, Soviet forces invaded Finland with 21 divisions, totalling 450,000 men, and bombed Helsinki, killing about 100 citizens and destroying more than 50 buildings. In response to international criticism, Soviet Foreign Minister Vyacheslav Molotov stated that the Soviet Air Force was not bombing Finnish cities but rather dropping humanitarian aid to the starving Finnish population; they were sarcastically dubbed Molotov bread baskets by Finns. The Finnish statesman J. K. Paasikivi commented that the Soviet attack without a declaration of war violated three separate non-aggression pacts: the Treaty of Tartu, which was signed in 1920, the non-aggression pact between Finland and the Soviet Union, which was signed in 1932 and again in 1934; and also the Covenant of the League of Nations, which the Soviet Union signed in 1934. Field Marshal C.G.E. Mannerheim was appointed Commander-in-Chief of the Finnish Defence Forces after the Soviet attack. In a further reshuffling, Aimo Cajander's caretaker cabinet was replaced by Risto Ryti and his cabinet, with Väinö Tanner as foreign minister because of opposition to Cajander's prewar politics. Finland brought the matter of the Soviet invasion before the League of Nations. The League expelled the Soviet Union on 14 December 1939 and exhorted its members to aid Finland. On 1 December 1939, the Soviet Union formed a puppet government, named the Finnish Democratic Republic, to govern Finland after Soviet conquest. Headed by Otto Wille Kuusinen, the government operated in the parts of Finnish Karelia occupied by the Soviets, and was also referred to as the "Terijoki Government", after the village of Terijoki, the first settlement captured by the advancing Red Army. After the war, the puppet government was reabsorbed into the Soviet Union. From the very outset of the war, working-class Finns stood behind the legitimate government in Helsinki. Finnish national unity against the Soviet invasion was later called the spirit of the Winter War. First battles and Soviet advance to Mannerheim Line The array of Finnish defence structures that during the war started to be