Led the Polish government in exile and helped organize exiled polish communities in Britain and the US. Furthermore, he kept close contact with the Home Army, although the organization was crippled in the 1945 crackdown following Göring's death by Polish Partisans (supposedly at least, his death is shrouded in mystery).
During the Ural War, despite being in his late 70s, he went to Russia to shore up the recruitment of Polish volunteer divisions from the millions who either fled or were expelled to the east. Polish divisions fought alongside other Eastern European exiles in halting the Nazi War machine from capturing West Russia and crossing the Ural Mountains. He also advised the Russian High Command militarily. Following the end of the war, he retired from his leadership of the exile government for a new generation to come in, but even if he's 80, the man would jump at the first chance to grab a gun if the Germans came knocking.
So while it's overall still a tragic story, at least he shows that despite the loss of Poland, the Polish people will fight on alongside so many others who lost everything to the Nazis. I would say only the Jews can really match the tenacity that the peoples living in the Russian Empire's territory has now when it comes to facing Germania.