Šajkaši were the river troops guarding the Danube
The Danube is a river in the Central Europe and the Europe's second longest river after the Volga. It is classified as an international waterway....

 and Sava, and especially, the Port of Belgrade
Port of Belgrade
Port of Belgrade is a cargo port on the Danube river in Belgrade, Serbia. It is located in the center of Belgrade, near Pančevo Bridge. The port also manages the passenger terminal on the nearby Sava river. Port transfer capacity is 3,000,000 tons per year and 10 000 TEUs...

, against the Ottoman Empire
Ottoman Empire
The Ottoman EmpireIt was usually referred to as the "Ottoman Empire", the "Turkish Empire", the "Ottoman Caliphate" or more commonly "Turkey" by its contemporaries...

 from the 16th to the 19th century. At the time, the rivers were borders of the Kingdom of Hungary
Kingdom of Hungary
The Kingdom of Hungary comprised present-day Hungary, Slovakia and Croatia , Transylvania , Carpatho Ruthenia , Vojvodina , Burgenland , and other smaller territories surrounding present-day Hungary's borders...

 and Habsburg Empire with the Ottoman Empire. They had special military status. Their name derives from the small wooden boat known as Tschaiken
Chaika (boat)
A chaika was a wooden boat with a mast and sail, a type of Galley, used by the:*Zaporozhian Cossacks in the 16th–17th centuries in Ukraine on the Dnipro River and the Black Sea....

(Šajka), a type of galley.

A group of Serbian Šajkaši settled in Slovakia
The Slovak Republic is a landlocked state in Central Europe. It has a population of over five million and an area of about . Slovakia is bordered by the Czech Republic and Austria to the west, Poland to the north, Ukraine to the east and Hungary to the south...

, where they continued their service, known in Slovak as čajkári.

The Šajkača
The Šajkača is the Serbian national hat or cap.-History:The Šajkača originated in the 18th century. It was originally worn by the Serbian river fleet as a military headgear in the service of the Habsburg Empire around the Danube and Sava Rivers...

hat is derived from the 18th-century Šajkaši
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