It is now 1453, and the Ottomans are besieging Constantinople . Their cannons kept firing at the city walls. Why are these guns so effective, and why are the defenders not having some of them?
Well…not just defenders. Not many people can throw similar artillery trains into the battlefield.
Ottomans were not just the successors of gun technology in the Islamic world, which introduced cannons into Europe and had a considerable impact in Iberia. They embraced this and made great efforts in developing gunpowder weapons and specialized forces that deal with them—their European and Near East counterparts are at the forefront in building such organizations.
Ottoman gun arm was born in the late 14th century and grew rapidly. By 1453 it was supplied by two cannon foundries located in Bursa and Edirne and a lean multinational human force, with extensive experience in casting cannons and using them on the battlefield.
Orban's famous "cathedral" attracted all the attention of the Ottoman artillery in Constantinople, but it was not the only one. The Cathedral is one of four giant shells arranged on the of the Constantinople walls. Behind it is ten cannons and fifty-six various small cannons. The so-called "darbzen" shells usually have an average of two kilograms per shell.
Seventy Siege Cannon is a very powerful artillery train that will only become bigger throughout the history of the Ottoman Empire - just three years later, the Ottoman Empire laid out three hundred cannons in front of the walls of Belgrade in , from giant bomber to various sizes of Dabson (although the siege will be far from successful).
The remnants of the Byzantine Empire have neither the funds nor the technical means to put anything comparable into the battlefield. Byzantine The last time a new cannon was cast in 1422, when the Ottoman Empire sieges the city - anything added since then has been a gift from European countries.
Byzantine Cannon Library is simply incomparable. Most of what they have is older and rather primitive work. Byzantine did not provide Mohammed with the large cannon foundry that heavy artillery , nor did they have the technology involved in making these cannons—even if they had, they did not have enough funds and dedicated manpower to form and maintain a large arsenal of modern Artillery .
Few countries in Europe do this - the Ottoman Empire is one of them and will continue to have one of the world's largest, most well-trained and best-equipped artillery units for more than two centuries. The Byzantine Empire was a dilapidated, poor country, facing the world's best artillery units - it was too much to expect them to compete with it.
they can't. Seventy Ottoman cannons roared on the ancient walls of Constantinople for fifty days, blasting them to pieces, and despite the arduous resistance, the fall of the city was inevitable. 
Fausto Zonaro-Mehmed the Conqueror's famous paintings enter Constantinople.
