When was the earliest possible time the European Christians could defeat the Ottoman Empire and capture all of Ottoman Europe?
I mean, after the Ottoman conquest of Constantinople, so no ERE anymore.
Let's say for example that the Christian Powers can get a functioning alliance / Crusade and fight the Ottomans together. Well, not all of of Europe, Sweden or England do not seem to have any interest in this. But let's say Austria, Poland, Venice, Genoa, Spain, remaining Balkan Christian statelets, maybe other German States, Italian States... I am not sure if we could add France to this...