The second Mongol invasion of Poland was carried out by general Boroldai (Burundai) in 1259–1260. During this invasion the cities of Sandomierz, Kraków, Lublin, Zawichost, and Bytom were sacked by Mongols for the second time.

The invasion began in late 1259, after a powerful Mongol army had been sent to the Kingdom of Galicia–Volhynia in order to punish King Daniel of Galicia for his independent actions. King Daniel had to comply to Mongol demands, and in 1258, his forces joined the Mongols in the raid on the Grand Duchy of Lithuania. To weaken Daniel's position, the Golden Horde decided to attack his allies, Hungarian King Béla IV, and Duke of Kraków, Bolesław V the Chaste. The purpose of the invasion was to loot the divided Kingdom of Poland (see Testament of Bolesław III Krzywousty), and to weaken Duke of Kraków Bolesław V the Chaste, whose province, Lesser Poland, began a process of fast development.

According to the Mongol plan, the invaders were to enter Lesser Poland east of Lublin, and head towards Zawichost. After crossing the Vistula, the Mongol army was to break into two columns, operating north and south of the Holy Cross Mountains. The columns were to unite near Chęciny, and then head southwards, to Kraków. Altogether, Mongol forces under Boroldai were 30,000 strong, with Ruthenian units of King Daniel of Galicia, his brother Vasilko Romanovich, Kipchaks and probably Lithuanians or Yotvingians.