Why do the bells ring at noon?

1453 – June 1456

Constantinople has fallen; the Sultan's guns are being cast for the next gate north. A voivode, a friar, and a peasant crusade gather to hold it.

Three years earlier, on 29 May 1453, Constantinople had fallen to Mehmed II after a 53-day siege, and the new Ottoman capital looked north-west toward the next gate: Belgrade, the “key to the realm”, the largest and most fortified border stronghold of Hungary, a triple fortress on the hill where the Danube meets the Sava. At the end of 1455 John Hunyadi — former Regent-Governor, now Captain-General of Hungary — began preparing at his own expense: 5,000 mercenaries into the fortress under his brother-in-law Michael Szilagyi and his own son Ladislas, a relief army of 12,000 professionals taking shape behind them, and in April 1456 a Diet decreeing general mobilisation. The Sultan, for his part, cast 22 great guns and many smaller ones and built a navy to sail up the Danube. And the Franciscan friar John of Capistrano, sent to Hungary and turned crusade preacher, drew some 25,000 crusaders to Hunyadi's banner — about 18,000 of them peasants, some carrying only clubs and slings. Against them, at the end of June, came the Ottoman host: 160,000 men in the early accounts, 60,000–70,000 in the newer research. On 18 June a Serbian army of some 9,000 sent to stop the advance was destroyed in the Morava valley. The road to Belgrade lay open.

4–14 July 1456

Ten days of bombardment shake the triple walls; then, on 14 July, five hours on the Danube decide whether the fortress eats.

Mehmed arrayed his host around the headland: the Rumelian corps with most of the 300 guns on the right, the Anatolian corps on the left, the Janissaries and his own command post in the centre, the river flotilla to the north-west, the Sipahi cavalry guarding the Danube flank. On 4 July the bombardment began, and for ten days the walls of the triple fortress shuddered under it while Szilagyi's 5,000–7,000 men held the breaches. Hunyadi, camped near Zemun with the relief army that Capistrano's preaching had swelled to 40,000–50,000 souls, understood that the fortress would starve before it surrendered: the river had to be forced first. He gathered every ship on the Danube — some 200 boats, a single galley among them — and agreed the signal with Szilagyi, who readied 40 vessels crewed by Serbians from the city. On 14 July the two fleets met. After 5 hours of battle on the river, Hunyadi broke the naval blockade: 3 large Ottoman galleys went to the bottom and 4 large vessels with 20 smaller ones were taken. Troops and much-needed food flowed into the fortress. The siege would have to be decided by storm.

15–22 July 1456

For a week the breaches burn and hold; on the night of 21 July the Sultan throws in everything, and on 22 July the besiegers become the besieged.

For days the Ottomans probed the breaches and were thrown back; a defender's cannonball killed Karaca Pasha, one of Mehmed's commanders. Then, on the evening of 21 July, the Sultan staked everything on one all-out assault that raged through the night. Janissaries flooded the lower city and pushed toward the upper town — until Hunyadi ordered tarred wood and everything flammable thrown down and set alight. A wall of flames cut the Janissaries inside the city off from the troops outside; those inside were massacred, those outside were beaten off the walls. At dawn the fortress still held. The next morning, against Hunyadi's explicit orders, groups of crusaders slipped out of the demolished ramparts to harass the Ottoman line; what began as a skirmish swelled into a sortie. Capistrano, who had tried to call his men back, ended up leading some 2,000 of them across the Sava into the Ottoman rear while Hunyadi charged out of the fort straight at the Sultan's guns. The Christians stormed the Ottoman camp and seized the artillery. Mehmed fought in person, killed several enemies, was wounded, and had to leave the field. That night the war council voted to end the siege; between 22 and 23 July the Ottoman army buried its dead, loaded its wounded onto wagons, and slipped away to the south-east. The next day the crusaders walked into an abandoned camp full of loot.

29 June – 6 August 1456

The bells were a prayer ordered before the battle; the feast was the answer after it. Then the plague collected both victors.

The bells were never a victory salute. Callixtus III signed the order on 29 June 1456, when Belgrade's fate was still unwritten: every church in Christendom was to ring its bells at noon so the faithful would pray for the defenders. The news of 22 July travelled slowly; it reached Rome on 6 August. The Pope answered it the only way left — by raising the Transfiguration, kept on 6 August, into a feast of the whole Roman rite. And because in some countries, like England and the Spanish kingdoms, the victory news arrived before the papal order did, the ringing was taken for a commemoration of the triumph — which is exactly how the legend was born. The order itself was never withdrawn, and the noon bell is still rung today. Victory had a bitter price. Plague broke out in the crusader camp: Hunyadi died of it on 11 August 1456 at Zemun and was buried in the cathedral of Alba Iulia; Capistrano preached his funeral sermon, then died of the same plague on 23 October at Ilok. The 22nd of July has been a memorial day in Hungary ever since. The triumph bought Europe some 70 years before the Ottoman advance resumed — Belgrade itself finally fell in 1521, to Mehmed's great-grandson Suleiman.