Koca Sinan Pasha
Sigismund Báthory made György Borbély Ban of Karánsebes (now Caransebeș in Romania), ordering him to invade the nearby Ottoman territories. Bocskai dispatched his deputy in Várad, György Király, to support Borbély's campaign. The Transylvanian army forced the Ottomans to abandon the fortresses along the Maros (Mureș) River before the end of October. However, Koca Sinan Pasha had meanwhile invaded Wallachia and captured Bucharest and Târgoviște. The Wallachian ruler, Michael the Brave, who had acknowledged Sigismund Báthory's suzerainty, was forced to retreat towards Transylvania. The grand vizier decided to transform Wallachia into an Ottoman province and made one of his commanders, Hasan Pasha, "beylerbey" (or governor) of Wallachia before he started to retreat in October.