defeat at Kutná Hora (21 December 1421), Zawisza was taken prisoner by the Hussites and subsequently released in return for a high ransom. War against Ottomans and death In 1428, Zawisza, with his retinue as a commander of a light cavalry banner of 500 horsemen, joined the forces of Sigismund in the king's war against the Ottoman Turks. During that disastrous campaign he fought them at the Siege of Golubac on the Danube in modern-day Serbia. Sigismund's army was defeated and had to retreat across the Danube, with only a few boats to ferry the troops over to safety. Zawisza's banner was guarding the retreating army. Being a man of importance, he was personally sent for by King Sigismund. Disheartened by the king's apparent cowardice, he allegedly refused to retreat, saying, "There is no boat big enough to lift my honour." He was either killed in combat at Golubac or executed in Ottoman captivity. Family Zawisza was survived by his wife Barbara and their children: Marcin, fell at the Battle of Varna in 1444. Stanisław, fell at the Battle of Varna in 1444. Zawisza (II). Jan, starost of Koło, who was killed at the Battle of Chojnice (1454). Barbara. He had a granddaughter, Barbara of Roznow, who was the mother of the Polish Renaissance military commander, hetman Jan Tarnowski. Among further descendants of Zawisza were Stanisław Koniecpolski, Bogusław Radziwiłł, governor of the Duchy of Prussia, and Henryk Dobrzański, the first guerrilla commander in World War II in Europe. Legacy During his life, he was regarded as a model of knightly virtues. After his death, he was praised by the Polish historian Jan Długosz, the poet and Canon of Gniezno Adam Świnka, and by King Sigismund of Luxembourg. Zawisza became a folk hero in Poland, famed for reliability, and loyalty. The Polish Scouts oath reads partly: "...polegać na nim jak na Zawiszy" ('[you can] rely on him as on Zawisza'). Several Polish football clubs and other sports teams were named after him, including, Zawisza Bydgoszcz. In Serbia, where the Golubac Fortress is located and where he is known as Zaviša Crni (), he was revered as a brave knight. A monument to Zawisza at Golubac Fortress bears the inscription: "In Golubac, his life was taken by the Turks in 1428, the famous Polish knight, the symbol of courage and honor, Zawisza the Black. Glory to the hero!" Also, in the reconstructed