Nikola Jurišić, born in Senj, Croatia, is…

Nikola Jurišić, born in Senj, Croatia, is first mentioned in 1522 as an officer of Ferdinand I of Habsburg's troops deployed in Croatian forts in defense against the invasion of the Ottoman Empire under Suleiman I, advancing towards Vienna.

He obtained knighthood between 1522 and 1526.

After the Battle of Mohács in 1526, the king made him the supreme army commander of the armed forces defending the borders (supremus capitaneus, Veldhauptmann unseres Kriegsfolks wider Turken).

Jurišić in turn had helped Ferdinand of Habsburg become the king of Croatia by brokering the 1527 election in Cetin.

Jurišić had been sent to Constantinople in 1530 to negotiate with the Ottomans for peace.

Suleiman leads one hundred and twenty thousand to one hundred and forty thousand troops on another campaign against Vienna in 1532, but it never truly materializes as his force is stalled by the Croatian Captain Nikola Jurišić during the Siege of Güns (Kőszeg) in western Hungary during the month of August.

Jurišić, with only seven hundred to eight hundred Croatian soldiers, manages to delay his force until winter closes in.

Charles V, now largely aware of Vienna's vulnerability and weakened state, assembles eighty thousand troops to confront the Ottoman force.