The Grand Duchy of Lithuania defeats the Crimean Khanate in the Battle of Kletsk.

The Grand Duchy of Lithuania was a sovereign state in northeastern Europe that existed from the 13th century, succeeding the Kingdom of Lithuania, to the late 18th century, when the territory was suppressed during the 1795 partitions of Poland–Lithuania. The state was founded by Lithuanians, who were at the time a polytheistic nation of several united Baltic tribes from Aukštaitija. By 1440 the grand duchy had become the largest European state, controlling an area from the Baltic Sea in the north to the Black Sea in the south.

The Crimean Khanate, self-defined as the Throne of Crimea and Desht-i Kipchak, and in old European historiography and geography known as Little Tartary, was a Crimean Tatar state existing from 1441 to 1783, the longest-lived of the Turkic khanates that succeeded the empire of the Golden Horde. Established by Hacı I Giray in 1441, it was regarded as the direct heir to the Golden Horde and to Desht-i-Kipchak.

The Battle of Kletsk was fought on 5 August 1506 near Kletsk, between the Grand Ducal Lithuanian Army, led by Court Marshal of Lithuania Michael Glinski, and the army of the Crimean Khanate, led by Fetih I Giray and Burnaş I Giray, sons of the Khan of Crimea, Meñli I Giray. The battle was one of the first and greatest Lithuanian victories over the Tatars.

August 5 is the 217th day of the year in the Gregorian calendar; 148 days remain until the end of the year.