|Battle of Prostken|
|Part of The Deluge (Second Northern War)|
| Polish-Lithuanian Commonwealth
|Commanders and leaders|
|Prince Georg Friedrich of Waldeck|
Prince Bogusław Radziwiłł (POW)
|Hetman Wincenty Gosiewski
Subhan Ghazi Agi
9 artillery pieces
|Casualties and losses|
|1,500 killed and captured Swedes|
Brandenburgers losses are unknown
9 artillery pieces
The Battle of Prostken was fought near Prostken, Duchy of Prussia (today Prostki in Ełk County, Poland) on October 8, 1656 between forces of the Polish-Lithuanian Commonwealth and allied Crimean Tatars commanded by hetman Wincenty Gosiewski on one side, and on the other allied Swedish and Brandenburg forces commanded by Prince Georg Friedrich of Waldeck, reinforced by cavalry of Prince Bogusław Radziwiłł. The Commonwealth forces won the battle, annihilating enemy forces and taking Radziwiłł captive.
In the late summer of 1656, Swedish and Brandenburgian armies left Warsaw, retreating towards northwest. Polish-Lithuanian commanders decided then to invade the Duchy of Prussia, which had been a vassal state to Kingdom of Poland, and which, as Brandenburg-Prussia, had been an ally of the Swedish Empire (see Treaty of Konigsberg (1656). The objective of the invasion was to make “The Great Elector”, Frederick Wilhelm, to end the alliance with Sweden. Polish-Lithuanian forces were commanded by Lithuanian Field Hetman Wincenty Korwin Gosiewski. They were supported by a unit of Crimean Tatars, under Subchan Ghazi Aga. Altogether, Gosiewski’s army had some 8,000 - 10,000 men (including 2,000 Tatars). In early October 1656, it crossed the Narew river, either near Lomza or Wizna, and headed northwards, to Lyck (Elk). Prussian commandant Prince Georg Friedrich of Waldeck concentrated his forces near Wasosz. His army had probably 3,500 men, mostly reiters and dragoons. Waldeck reached Prostken (Prostki) on October 6, and camped on the eastern bank of the Elk river, near a bridge, which he planned to defend. He also got in touch with Boguslaw Radziwill, whose cavalry unit of 800 stationed in Rajgrod. Furthermore, additional Prussian units were stationed at some distance from Lyck. Upon hearing of the invasion, they set off to help Waldeck, but only some 1,000 men reached Prostken before the battle. A unit of 2,000 men and 12 cannons left Lyck on October 8, which was too late.
In the morning of October 8, first Tatar and Lithuanian units reached Prostken, while main forces were some two hours behind them. Gosiewski, who enjoyed numerical superiority over the enemy, decided to make the Prussians abandon their positions behind the river, and to destroy them in open field. At the same time, he sent Tatars towards Lyck, to face the Prussian reinforcements. In the first stage of the battle, the Lithuanians pretended to retreat, after an initial clash. This worked, as the Prussians crossed the river, while Waldeck, upon receiving news of Tatars, sent a cavalry unit of 500 towards Lyck. This unit was reinforced by the cavalry of Boguslaw Radziwill, which soon afterwards clashed with Tatars. When main Lithuanian force attacked the Prussians, Waldeck ordered his troops to return behind the river. Gosiewski attacked the Prussians, forcing them to retreat. Meanwhile the Tatars crossed the Elk, and attacked the camp. Soon afterwards, they were joined by the Lithuanians. The unit of Boguslaw Radziwill was completely destroyed, while Radziwill himself was captured. Prince Waldeck, with 500 soldiers, managed to escape, as the Tatars and the Lithuanians were too busy looting the Prussian camp. Altogether, the battle lasted app. five hours.
After the victory, Gosiewski sent a letter to Frederick Wilhelm, urging him to abandon the Swedes. The Great Elector rejected this, which resulted in widespread looting and destruction of southeastern corner of the Duchy of Prussia, toether with neighbouring Polish counties of Wizna and Rajgrod. Gosiewski then marched with his army to Lithuania, while the Tatars returned to the Crimea.
- ↑ Sławomir Augusiewicz, Prostki 1656, Warszawa 2001, Dom Wydawniczy Bellona. p 96. ISBN 83-11-09323-7
- ↑ Sławomir Augusiewicz, Prostki 1656, Warszawa 2001, Dom Wydawniczy Bellona. p 93. ISBN 83-11-09323-7
- ↑ Sławomir Augusiewicz, Prostki 1656, Warszawa 2001, Dom Wydawniczy Bellona. p 73. ISBN 83-11-09323-7
- ↑ Sławomir Augusiewicz, Prostki 1656, Warszawa 2001, Dom Wydawniczy Bellona. p 116. ISBN 83-11-09323-7
- ↑ Sławomir Augusiewicz, Prostki 1656, Warszawa 2001, Dom Wydawniczy Bellona. p 117. ISBN 83-11-09323-7
- Mała Encyklopedia Wojskowa, 1967, 1st edition (Polish)
- Jacek Płosiński, Potop szwedzki na Podlasiu 1655-1657, Inforteditions Publishing, Poland, 2006. ISBN 83-89943-07-7
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