I think Polaks should at least say TY to Serbs because they got Winged Hussar Xin for free :D
Was just reading something about medieval eastern cavalry for my history exam and realized that both Hungarian and Polish Hussars were descendants of the Serbian Gusars who were primarily called Rac (Hungarian exonym for Serbs because moderns history says that Serbs are probably descendants of the mixture of Thrakians and Slavs cuz their medieval land was called RAS/RASCIA - THRASCIA and Serbs were called RASCIANS even tho that's not completely confirmed because many believe Serbs are a 100% south Slavic tribe even tho Serbian main Haplogroup is I2a 46% which is common for Thrakians while R1a around 20% in Serbia is common for Slavs). Initially the first units of Polish hussars in the Kingdom of Poland were formed in 1500, its influences coming from Serbian mercenaries. A small number of Serbian mercenaries were recruited and became Polish–Lithuanian Commonwealth citizens.