Hunyadi persuaded John Jiskra of Brandýsa Czech commander who controlled the northern regions (in present-day Slovakia)to sign an armistice for three years on 13 September. However, Jiskra did not keep the truce, and armed conflicts continued. In November Hunyadi proceeded against Frederick III of Germany, who had refused to release Ladislaus V and seized Kőszeg, Sopron and other towns along the western border. Hunyadi's troops plundered Austria, Styria, Carinthia and Carniolia, but no decisive battle was fought. A truce with Frederick III was signed on 1 June 1447. Although Frederick renounced of Győr, his position as the minor King's guardian was confirmed. The Estates of the realm were disappointed and the Diet elected Ladislaus Garaia leader of Hunyadi's opponentsPalatine in September 1447.