In 1654 he received the Commander's baton/mace from Polish prince Janusz Radziwiłł, who was appointing the Lithuanian Great-Commander. During the Swedish invasion he played an important role politically and militarily. In 1655, he accepted the Kiejdany act of recognition signed between usurper King Charles X Gustav of Sweden and Prince Janusz Radziwiłł, but soon came against this act taking action which aim was to help the Russian side. Despite being under surveillance, he managed to make contact with the Russian diplomat Vasily Likharov. Trapped by Janusz Radziwiłł he was catch in Kiejdany, where, as state prisoner was then transferred to Królewiec/Königsberg. While he was in captivity Karl Gustav was urged to attack Russia and a written confirmation of that intention was given to Tsar Alexis of Muscovy after his release. In the spring of 1656 he escaped from Prussian slavery to Lithuania where in a short time, at their own expense, he organized several Banners. Battling against Swedish forces, he reached up near Warsaw, where he was one of the royal commissioners that oversaw the takeover of the capital. He participated in the siege of Tykocin and the Battle of Warsaw after which the Swedish army again occupied the city. Then, on the King´s orders, he moved with its banners into the Duchy of Prussia and Lithuania. On 8 October 1656, at the battle of Prostki, he completely smashed the Brandenburgian and Swedish armies, capturing Prince Bogusław Radziwiłł. The battle has been describe by Henryk Sienkiewicz's novel The Deluge. Another battle fought under his command, on 22 October 1656, was the Battle of Filipów however; it ended with a victory for the forces commanded by Field MarshalGustaf Otto Stenbock, in the confusion of the battle the Prince Bogusław Radziwiłł managed to escape. In November 1656 at Wierzbowo he signed a truce with Frederick William, Elector of Brandenburg, then as royal commissioner in 1657, he led a ceasefire and conclude the Treaty of Bromberg. In 1658 he fought against the Swedes in the areas of Livonia and Samogitia. In 1658 he participated in the delegation sent by the King to negotiate with Russia. Beaten at the Battle of Werki he was captured and imprisoned during nearly four years. He was released from captivity in Moscow in 1662. As compensation for the harm that he had suffered, he received the former Radziwiłł's estate in Kiejdany.
Obedience to the King and death
He was a supporter of a strong and centralized royal power, and supported the concept of a successor of the throne with the current King being still alive. At the command of the King wanted to solve the issue of the Fraternal Association, an insurrection created by some long unpaid members of the army claiming the termination of obedience to the King. In July 1662, he went to Vilnius for talks with the rebel troops in Lithuania. There he was treacherously captured by Konstanty Kotowski, Deputy Speaker of the Fraternal Association, which is thus intended to prevent any agreement that may in effect resulted in the termination of the insurrection. Wincenty Korwin Gosiewski was shot to death on 29 November 1662 near Ostrynia. Later, the perpetrators of the murder were sentenced to death.
Marriage and family
Wincenty Korwin Gosiewski´s children and Magdalena Konopacki were:
Bogusław Korwin Gosiewski de armis Ślepowron –Bishop of Smolensk on 29 January 1725, Lithuanian Great Quartermaster in 1720, Preceptor and Curator of Vilnius Cathedral, Vicar of Onikszty.
Her first husband, Józef Bogusław Słuszkade armisOstoja was Field-Commander of Lithuania, Castle-Commander of Vilnius, Court Marshal of Lithuania, Great-Standard-Bearer of Lithuania, Great-Hunter of Lithuania, District-Governor of Rzeczyca, Lanckorona, Pinsk, Pieniawa and Jeziera.
