between Germany and the USSR. The defined Soviet sphere of interest matched the territory subsequently captured in the campaign. The Soviet and German troops met each other on a number of occasions. Most remarkably, on 22 September 1939, the German XIX Panzer Corps had occupied Brest-Litovsk, which lay within the Soviet sphere of interest. When the Soviet 29th Tank Brigade approached Brest-Litovsk, the commanders negotiated a German withdrawal, and a joint parade was held. Just three days earlier, however, the parties had a more damaging encounter near Lviv, when the German 137th Gebirgsjägerregimenter (mountain infantry regiment) attacked a Soviet reconnaissance detachment.; After a few casualties on both sides, the parties negotiated, the German troops left the area, and the Red Army troops entered L'viv on 22 September. According to post-1991 Russian sources, the Red Army force in Poland numbered 466,516. The Red Army troops faced little resistance, mainly due to the entanglement of the majority of the Polish forces in fighting Germans along the Western border, but partly due to an official order by the Polish Supreme Command not to engage in combat with the Soviet troops, and also partly because many Polish citizens in the Kresy region—Ukrainians and Belarusians—viewed the advancing troops as liberators. Organization of Ukrainian Nationalists rose against the Poles, and communist partisans organised local revolts, e.g. in Skidel, robbing and murdering Poles. Nonetheless, the Red Army sustained losses of 1,475 killed and missing and 2,383 wounded. The losses of the opposing Polish troops are estimated at 6,000–7,000. The Finnish campaigns The Winter War began when the Soviet Union attacked Finland on 30 November 1939, two months after the invasion of Poland by Germany that started World War II. Because the attack was judged as illegal, the Soviet Union was expelled from the League of Nations on 14 December. The war ended on 13 March 1940. The Continuation War was the second of two wars fought between Finland and the Soviet Union during World War II. On 25 June 1941 the Soviet Union conducted an air raid on Finnish cities, prompting Finland to declare war and to allow German troops stationed in Finland to begin an offensive. By September 1941, Finland had regained its post–Winter War concessions to the Soviet Union: the Karelian Isthmus and Ladoga Karelia. However, the Finnish Army continued the offensive past the 1939 border during the conquest of East Karelia, including Petrozavodsk, and