Iskander Pasha (Iskanderbasha), beylerbey (bejlerbej) of Bosnia, defeats magnate forces in August 1616 on the very same spot at Sasowy Róg, with Duke Samuel Korecki and the Movilă family ending up as prisoners in Constantinople (Wiśniowiecki had died prior to imprisonment.)

The Sultan, after yet another wave of Cossack raids in 1617, sends a powerful force under Iskander Pasha to the Commonwealth borders.

The army consists of janissaries, Tatars and vassal troops from Transylvania, Moldavia and Wallachia (numbering up to forty thousand).

Żółkiewski meets them near Busza (on the Jaruga River), but neither side can decide to attack, and letters between leaders have been exchanged since the start of Iskander’s march.

Żółkiewski has mostly magnate troops and no Cossack troops, as the Commonwealth is simultaneously waging war with Muscovy and with the latest Swedish aggression against Livonia, while the Ottomans are at war with Persia.

Żółkiewski is forced to renounce all Polish claims to Moldavia through the Treaty of Busza (also known as the "Treaty of Jaruga") signed with Iskander Pasha.

The treaty states that Poland will not meddle in the internal affairs of Ottoman vassals in Transylvania, Moldavia, and Wallachia, and that the Commonwealth is to prevent Cossacks from raiding lands in the Ottoman Empire, while ceding Khotyn.

The Turks promise in return to stop Tatar raids.