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If the Ottomans had taken Vienna in 1529, they would, at the very least, have gotten what they had gone to war for: a full conquest of Hungary with the Hapsburgs booted out.
What now?
Do the Ottomans try to keep Vienna, or do they withdraw, content at having utterly humiliated the Holy Roman Emperor and broken his power in Hungary?
Do the Ottomans keep John Zápolya as their vassal, or do they annex Hungary nevertheless?