Gentlemen, I am proud to say that today in Hearts of Iron II (CORE Mod), British tanks under Montgomery reached Konigsberg in December of 1944, supported by Canadian and Republican Spanish troops, while another British thrust under Crocker and O'Connor liberated Warsaw. Best I've ever done in the land war.
It was basically won in June of '44, when Alan Brooke took six divisions and landed amphibiously behind German troops besieging Spain, and then another twenty British and fifty Spanish divisions came crashing over the border, crushing forty German and Slovak divisions, including almost all of the Nazi armor in France. (The 1st SS Leibstandarte survived long enough to be encircled and crushed by Horrocks' 30 Corps near Lorraine.)