1452: Building of Boğaz kesen by Mehmed II on the European shore of Bosporos
4-7 April 1453: Gathering of the Ottoman troops in front of the walls of Constantinople
12 April: Bombarding against the walls of Constantinople
18 April: First unsuccessful assault of the Ottoman troops
20 April: 4 ships break the iron ring of the Ottoman fleet and enter the Golden Horn, in order to join with the besieged ones. Replacement of the admiral of the Ottomans
22 April: Part of the Ottoman fleet is transported by land into the Golden Horn
7 and 12 May: Assaults of the Ottoman troops
21 May: Rejection by the Byzantines of Mehmed’s proposal to surrender the city on favorable terms
29 May: Fall of Constantinople to the Ottoman troops