First riders of Winged cavalry that latter turn to be Husaria were Serbian Winged Gusari (Eng. winged bandits, pirates). Among them were then recruited first military commanders and masters of cavalry martial arts for further training. That`s how Husaria was born in Poland and in Hungary, too. Some of those first Winged riders retreated to Poland from declining Serbian Empire because of Ottoman Turkish invasion. There were complete Serbian military regiments. Later, when Serbian Despotate was formed, considering that was Rascia (central Serbian medieval land) part of the realm of the Polish Kings, Serbs respected obligations and regiments of Winged cavalry were regularly officially dispatch to Poland.
Jan Sobieski played great role in the process of massive arrival of Serbians to Poland. That way he most directly contributed to consolidation of Polish cavalry doctrine. Sobieski salvaged best from collapsing Serbian Empire. In his time Sobieski was Grand Master of the Dragon Order, noble order that was originally founded by Serbian Voivode of Knights Milos Obilic in attempt to resist to Ottoman invasion. In Kosovo battle, 1389 Turks vs. Serbs, Dragon Order acomplished one of its main aims and that was elimination of the Turkish Sultan Murad who was killed in battle by the Obilic himself who was then also slain by Sultan`s axe bearing bodyguards.
One of the major roles of the Serbs in Polish service was during Orsha battle, 1514, Grand Duchy of Lithuania and the Kingdom of Poland, under the command of Hetman Konstanty Ostrogski vs. army of the Grand Duchy of Moscow under Konyushy Ivan Chelyadnin and Kniaz Mikhail Golitsin. Konstanty Ostrogski relied on Serbian husars as his trump card and won. There, Serbians once more proved themselves as the military elite of rising Sarmatian Commonwealth.Orsha battle, 1514