The Swedes thought to cross the river at this point and then continue their march along the Polish coast.

[2] On March 24 the bridgehead, the city and the castle were attacked by Jerzy Sebastian Lubomirski, with a Polish corps of 6,000 men.

However, Swedish garrison managed to flee down the river San in boats, saving most of the provisions, while the main army's artillery shelled the Poles.

However, 4,000 grenades were left with matches lit, so the castle was blown in the air, together with several hundred Poles.

Lithuanians who held this river bank believed the entire Swedish army was on them, and fled in panic.