On March 12, 1537, the Ottoman army captured the Croatian fortress of Klis, which had been under siege for more than 15 years. This fortress, located above the city of Split, served as a critical stronghold in the defense against Ottoman conquerors. The fall of Klis marked a significant moment in the prolonged conflict between the Ottomans and various European powers during the 16th century, particularly in the context of the Habsburg and Venetian Empires.

The siege of Klis was part of a larger series of conflicts that saw notable Croatian warriors rise to prominence. Among them was Petar Kružić, a famous captain known for his leadership and valor. His efforts alongside the ban, Petar Berislavić, in battles such as the one at Plješivica showcased the intense struggle faced by the Croatian defenders against a powerful foe, culminating tragically with Berislavić's execution. This era in Croatian history is marked by tales of heroism and significant military engagements that prompted recognition across Europe.

Kružić's legacy and the events at Klis are emblematic of the broader narrative of resistance against the Ottoman Empire that characterized Croatian and Central European history during this tumultuous period. The loss of Klis was not only a military defeat but also a national tragedy that underscored the challenges faced by the Croatian people in maintaining their sovereignty and integrity against Ottoman advances.