Actually we were in sort of a war with Germany, in the end of 1944. It was a part of the peace agreement made with Sovjet. We had to chase out all the German troups, that were stationed mainly in Lappland in the north of Finland.
But you are right, Germany supplied us some weapons and military help, especially during the beginning of what we call ”the continuing war” (1941-1944).
During the winter war, (Nov 30.1939-March 13.1940), when Sovjet attacked us, we got help from many countries, also the USA. The Stalin had thought he can take Finland in 2 months, but our troups gave Stalin a real fight, and we managed to keep our freedom, and did not end up in the CCCP, as happened to for example the Baltic States. But we lost quite a lot of area to Sovjet.
After this we lived in peace until summer 1941. We had no good choises, and we knew that we will be drawn into war again, so we teamed up with the Germans, sort of choose the least bad out of many bad things. And then Finland attacked Sovjet att the same time as Germany started their operation Barbarossa. We hoped to get back all the lost areas, that we’ve lost after the winter war.
The outcome was as we know, so we once again lost, and had to give up even more land. But most importans, we kept our independence.