In the spring of 1593, Ottoman forces from the Eyalet of Bosnia laid siege to the city of Sisak in Croatia, starting the Battle of Sisak that eventually ended in a victory for the Christian forces on June 22, 1593. That victory marked the end of the Hundred Years' Croatian-Ottoman War . The war started on July 29, 1593, when the Ottoman army under Sinan Pasha launched a campaign against the Habsburg Monarchy and captured Győr  and Komarom  in 1594.
Question: What season was the Battle of Sisak started in?
Answer: spring