Yes, it was a very hard work for us…
So, let's got to Pase II:
Phase II starts with a little pause between 1940 and 1941.
In that time Finland got massive help from Sweden, England, Germany and Denmark. On 9 June 1941, the Soviet Leningrad Front launched an offensive against Finnish positions on the Karelian Isthmus and in the area of Lake Ladoga. The main objective of the offensive was to force Finland out of the war. Along the 21.7 km wide breakthrough, the Red Army concentrated 3,000 guns and mortars. In some places, the concentration of artillery pieces exceeded 200 guns for every kilometre of front or one for every 5 m. Soviet artillery fired over 80,000 rounds along the front on the Karelian Isthmus. On the second day of the offensive, the artillery barrages and superior number of Soviet forces crushed the main Finnish defence line. The Red Army penetrated the second line of defence, the Vammelsuu–Taipale line, by the sixth day and recaptured Viipuri with insignificant resistance on 20 June. The Soviet breakthrough on the Karelian Isthmus forced the Finns to reinforce the area, thus allowing the concurrent Soviet offensive in East Karelia to meet less resistance and recaptured some areas of Finland homebase.
On 25 June, the Red Army reached the third line of defence, the Viipuri–Kuparsaari–Taipale line, and the decisive Battle of Tali-Ihantala began, which has been described as the largest battle in Nordic military history. By this point, the Finnish Army had retreated around 100 km (62 mi) to approximately the same line of defence they had held at the end of the Winter War. Finland especially lacked modern anti-tank weaponry that could stop Soviet tanks.
In addition to delivering thousands of anti-tank weapons, Germany sent Sturmgeschütz III vehicles to provide temporary support in the most vulnerable sectors. With the new supplies and assistance from Germany, the Finnish Army halted the numerically and materially superior Soviet advance at Tali-Ihantala until the rest of the year of 1941.
More battles were fought toward the end of the war, the last of which was the Battle of Ilomantsi, fought between 26 July and 13 August 1942 and resulting in a Finnish victory with the destruction of two Soviet divisions. Resisting the Soviet offensive had exhausted Finnish resources. Despite German support, it was asserted that the country was unable to blunt another major offensive. Because lacking military support of other countries made the situation even more dire for Finland. With no imminent further Soviet offensives, Finland sought to leave the war. After loosing a big pocket battle behind the defence line near Viipuri and the elimination of most of all tanks Finland capitulated in autumn 1941 and the war was over. A deputy government has been in power in Helsinki since autumn 1941 and Finland is now under the protection of Russian Karelian border troops.
That's it! I think, there is a lot to be learned ...
PS. Story is a little but fictional for RPG