The Siege of Bar[a] was a siege of a Polish garrison led by Bernard Pretwicz in the fortress Bar (now Ukraine) by Moldavian-Wallachian army that took place in February of 1550.
Ottoman sultan Suleiman the Magnificent ordered Moldavians to attack Podolia, possibly to capture Bernard Pretwicz. They attacked the region and besieged Bar, the siege however failed and the Romanian army withdrew to Ottoman Empire, but at the same time Pretwicz was soon deposed from the seat of starosta in Bar, ending a series of his military campaigns.
Background
Bernard Pretwicz was an active participant of the "border war",[b] of XVI century. He led numerous campaigns against the Tatars, reportedly winning over 70 battles against them. His most well-known raids took place in March 1540 and 1541, when he attacked Ochakov and Akkerman, in 1545, when he led a major naval expedition and sacked Ochakov,[3] in 1547 and 1548, when he twice raided Jedisan.[4] Many sources mention that the attack on Ukrainian lands was directly ordered by Suleiman the Magnificent as a response to Pretwicz's border raids on the Ottoman and Tatar territories.[5][1]
Siege
On 13 of February 1550, a large 5,000-strong Moldavian-Wallachian army crossed the Dniester river near Mohyliv and attacked Bar. Soon, Moldavians entered the city, but Pretwicz had already led his army out of the castle. A battle took place, as a result of which, the Moldavians were defeated,[1] suffering heavy casualties, reportedly up to 100 cavalrymen were killed in the battle.[1] After the failure of their assaults, Moldavians started retreating from Poland. Pretwicz then chased the attackers, caught up with them and defeated, reportedly killing "half of the Vlach army" and capturing one of their commanders.[1] Some of the Moldavian army remnants were routed by Mikołaj Sieniawski.
Mykhailo Hrushevskyi gives a different view of the siege, however. According to him, the Moldavians besieged Bar, but due to artillery fire and resistance of the garrison were forced to withdraw back, destroying the villages that laid in their path,[6][5] yet not being routed.[2]
Aftermath
In December of the same year, Pretwicz was summoned to a Sejm, where he was accused of violating the peace on the Borderlands. He had explained the Moldavian invasion by the willing to devastate the local villages and to return the Moldavian colonizers that had escaped to Podolia.[2] Different explanation was given by the Moldavian prince Ilie Rareș, who had explained the attack by "simply following Suleimans order".[1] Yuri Soroka mentions Dmytro Vyshnevetsky participating in the defense of Bar from Moldavians.[5] Later, Pretwicz conducted one more anti-Ottoman raid before being deposed from the seat of the Bar starosta due to numerous complaints from the Ottoman government and instead being appointed as a starosta of Trembowla.[7]Vyshnevetsky, who had also participated in the city defense, was appointed as a starosta of Kaniv and Cherkasy same year.[4]
↑The name given by Hrushevskyi to the conflict that consisted the Tatar raids into Ukrainian lands and the counter-raids by border starostas and Zaporozhian Cossacks
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Kingdom of Poland 
Moldavia 
Wallachia