The Jagiellon rivalry with the House of Habsburg in central Europe was ultimately resolved to the Habsburgs' advantage. The decisive factor that damaged or weakened the monarchies of the last Jagiellons was the Ottoman Empire's Turkish expansion. Hungary's vulnerability greatly increased after Suleiman the Magnificent took the Belgrade fortress in 1521. To prevent Poland from extending military aid to Hungary, Suleiman had a Tatar-Turkish force raid southeastern Poland–Lithuania in 1524. The Hungarian army was defeated in 1526 at the Battle of Mohács, where the young Louis II Jagiellon, son of Vladislas II, was killed. Subsequently, after a period of internal strife and external intervention, Hungary was partitioned between the Habsburgs and the Ottomans.