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Fall of Constantinople
 
State of the Byzantine Empire
 
Preparations
 
Siege and final assault of the city
 
Aftermath
 
References
Siege and final assault of the city

Mehmed planned to attack the Theodosian Walls, the intricate series of walls and ditches protecting Constantinople from an attack from the west, the only part of the city not surrounded by water. His army encamped outside the city on Easter Monday, April 2, 1453. For weeks Mehmed's massive cannon fired on the walls, but it was unable to sufficiently penetrate them, and due to its extremely slow rate of reloading the Byzantines were able to repair most of the damage after each shot. Meanwhile, Mehmed's fleet could not enter the Golden Horn due to the boom the Byzantines had laid across the entrance. To circumvent this he built a road of greased logs across Galata on the north side of the Golden Horn, and rolled his ships across. This succeeded in stopping the flow of supplies from Genovese ships and demoralized the Byzantine defenders. Furthermore, the defenders were forced to disperse part of their forces to the Golden Horn walls, causing defense in other walls to weaken.

The Turks made numerous frontal assaults on the wall, but were repelled with heavy losses. They then sought to break through the walls by constructing underground tunnels in an effort to sap them. Many of the sappers were Serbians sent from Novo Brdo by the Serbian Despot. They were placed under the rule of Zaganos Pasha. However, the Byzantines employed an engineer named Johannes Grant (who was said to be German but was probably Scottish), who had countertunnels dug, allowing Byzantine troops to enter the tunnels and kill the Turkish workers. Other Turkish tunnels were flooded with water. Eventually, the Byzantines captured and tortured an important Turkish engineer, who revealed the location of all the Turkish tunnels, which were then destroyed.

Mehmet II: at the battle field.Mehmed offered to raise the siege for an astronomical tribute that he knew the city would be unable to pay. When this was declined, Mehmed planned to overpower the walls by sheer force, knowing that the Byzantine defenders would be worn out before he ran out of troops.

On May 22, 1453, the moon, symbol of Constantinople, rose in dark eclipse, fulfilling a prophecy on the city's demise. Four days later, the whole city was blotted out by a thick fog, a condition unknown in that part of the world in May. When the fog lifted that evening, "flames engulfed the dome of the Hagia Sophia, and lights, too, could be seen from the walls, glimmering in the distant countryside far behind the Turkish camp (to the west),". This was interpreted as some as the Holy Spirit departing from the Cathedral. All these phenomeae were however local effects of the cataclysmic Kuwae volcanic eruption in the Pacific Ocean. The "fire" seen was an optical illusion due to the reflection of intensely red twilight glow by clouds of volcanic ash high in the atmosphere.

On the morning of May 29 the attack began. The first wave of attackers, the azabs (auxilaries), were poorly trained and equipped, and were meant only to kill as many Byzantine defenders as possible. The second assault, consisting largely of Anatolians, focused on a section of the Blachernae walls in the northwest part of the city, which had been partially damaged by the cannon. This section of the walls had been built much more recently, in the eleventh century, and was much weaker; the crusaders in 1204 had broken through the walls there. The Ottoman attackers also managed to break through, but were just as quickly pushed back out by the Byzantine defenders. The Byzantines also managed for a time to hold off the third attack by the Sultan's elite Janissaries, but a Genovese general in charge of a section of the defense, Giovanni Giustiniani, was grievously wounded during the attack, and his evacuation from the ramparts caused a panic in the ranks of the defenders.

Some historians suggest that the Kerkoporta gate in the Blachernae section had been left unlocked, and the Ottomans soon discovered this mistake (there was no question of bribery or deceit by the Ottomans; the gate had simply been overlooked, probably because rubble from a cannon attack had obscured or blocked the door). The Ottomans rushed in. Constantine XI himself led the last defense of the city, and throwing aside his purple regalia, dove headfirst into the rushing Ottomans, dying in the ensuing battle in the streets, like his soldiers.