[2] During the Muscovite–Lithuanian War of 1503, the Crimean Tatar armies pillaged the Lithuania's southern towns of Slutsk, Kletsk, and Nyasvizh and even threatened the capital city of Vilnius.

[3] In summer 1506, Grand Duke Alexander's health deteriorated and he decided to convene a Seimas in Lida so that he could transfer the Lithuanian throne to his brother Sigismund I.

At Loyew they crossed the river Dnieper and around July 20–22 established their main camp at Kletsk – the town was devastated by them in 1503 and posed no serious threat.

[3] On 3 August the Lithuanians learned the Tatar camp's location and marched all night towards Kletsk, covering a distance of about 80 kilometres (50 mi) in 24 hours – an impressive accomplishment for the day and age.

Therefore, Glinski split his army in half, so that he might attack the Tatars from two sides and block retreat routes, and built two pontoon bridges across the rivers as the combatants exchanged artillery fire.

[3] When Glinski led the left wing forward to the assault, the Lithuanians easily broke through the defenses and attacked the main Tatar forces from the rear.

[5] But when Grand Duke Alexander Jagiellon died on 19 August, Zabrzeziński accused Glinski of having conspired to murder the dead ruler.

[3] Glinski fell from royal favor and began an anti-Lithuanian revolt, murdering Zabrzeziński and allying with the Grand Duchy of Moscow.

[3] Khan Meñli I Giray of Crimea hurried to assure Alexander Jagiellon that the raid was unauthorized and asked to maintain peace.