Here's a brief summary as to what happened to the glorious Constantinople. According to Rodney Castleden's Events That Changed The World, "The allies of the Byzantine Empire had gradually fallen away; the garrison was equipped with obsolete weapons; the city itself had been in decline for some time and its days were numbered. Constantinople had been exploited by the Venetians and Genoese an betrayed by Slav and Byzantine princes. It was an isolated, friendless, vulnerable city; a sitting target for an attack by the Ottoman empire. The Ottomans had for a long time nursed the dream of harnessing and capturing Constantinople."
Extracted from the second paragraph of an article entitled The sack of Constantinople, found in this website, it says, "By the middle of the fifteenth century, the prominence of Constantinople and the Byzantine Empire that it ruled had suffered a dramatic decline. The city found itself entirely surrounded by an Ottoman Empire eager to expand its domain. The final blow came in the spring of 1453 when the Ottoman Turks, led by the Sultan Mehmed II, besieged the city for fifty-seven days. On May 29 the Sultan led an over-whelming force that successfully breached the walls of the city and proceeded to massacre the citizenry. Following his victory, the Sultan moved the Ottoman capital from Adrianople to Constantinople. The last vestige of the ancient Roman Empire was no more." That extraction would complete the brief summary of what happened on May 29, 1453.
...but...no matter how much a person were to elaborate and use the most precise of words when writing about the fall of Constantinople, nothing will ever equal the horror of this harrowing and terrible spectacle.
An observer describes the scene:
"Nothing will ever equal the horror of this harrowing and terrible spectacle. People frightened by the shouting ran out of their houses and were cut down by the sword before they knew what was happening. And some were massacred in their houses where they tried to hide, and some in churches where they sought refuge.
The enraged Turkish soldiers . . . gave no quarter. When they had massacred and there was no longer any resistance, they were intent on pillage and roamed through the town stealing, disrobing, pillaging, killing, raping, taking captive men, women, children, old men, young men, monks, priests, people of all sorts and conditions . . .
***When Mehmed (II) saw the ravages, the destruction and the deserted houses and all that had perished and become ruins, then a great sadness took possession of him and he repented the pillage and all the destruction. Tears came to his eyes and sobbing he expressed his sadness. 'What a town this was! And we have allowed it to be destroyed'! His soul was full of sorrow. And in truth it was natural, so much did the horror of the situation exceed all limits."
My heart shattered into pieces when I read that preserved eye-account. I could not hold back the anguish and sorrow of my dropping heart, the bitter-aching woe at that moment. If I could time-travel back into history, I ought to change everything that had happened to Constantinople at the 29th of May, 1453. I would equip myself and bring along all those modern missiles to combat the seige of the Ottomans on Constantinople.