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In 29 May 1453 Ottomans entered Constantinople after a 2 months siege through an unguarded gate (called Kerkoporta)... When the first turkish flags raised upon the towers chaos ensued and every resistanse ceased...
WI the defenders retreated and organised an second line of defense in the old Constantinian Walls (which were as good as the Theodosian Walls though not as thick...) while the Emperor or Grand Duke Notaras delayed them long enough so the others could organise a second defensive line?
Is it possible to repeal the Ottoman attack?
Constantinople would have fell but could Constantine XI buy some extra time by reorganising defense in Constantinian Walls?