The Battle of Kłecko was fought on May 7, 1656, between forces of the Polish–Lithuanian Commonwealth commanded by Regimentarz Stefan Czarniecki and Jerzy Sebastian Lubomirski and a Swedish force commanded by prince Adolf Johan av Pfalz-Zweibrücken. The Polish–Lithuanian force was more than 12,000 strong and consisted mostly of cavalry, while the Swedes numbered around 7,000 artillery, infantry and cavalry. The Swedes achieved a tactical victory in that they escaped destruction by the Poles, who were unable to get to the Swedish army entrenched behind the Welnianka River, and various ditches and swamps. Swedish army lost 428 dead, while the Polish army sustained 70 dead and wounded, 2,000 dead or 3,000 dead, including 40 companions dead.

Stefan Czarniecki was a Polish nobleman, general and military commander. In his career, he rose from a petty nobleman to a magnate holding one of the highest offices in the Commonwealth, something that was unprecedented in the Commonwealth's history. On 22 July 1664 he received the office of the Voivode of Kijów and on 2 January 1665, a few weeks before his death, he was given the office of Field Hetman of the Crown of the Polish Kingdom. He is remembered as an accomplished military commander, and regarded as a Polish national hero. His status in Polish history is acknowledged by a mention of his name in the Polish national anthem.