Friedrich and the Austrian Navy had their first major military encounter during the Oriental Crisis of 1840. After his victory over the Ottoman Empire during the First Egyptian-Ottoman War, Muhammad Ali of Egypt conquered large parts of Syria. In 1839, the Ottomans attempted to reclaim these territories but after a decisive defeat at the Battle of Nezib, the Ottoman Empire appeared on the verge of collapse. Through the Convention of London, the United Kingdom, Austria, Prussia, and Russia intervened to save the Ottoman Empire. The Convention offered Muhammad Ali hereditary rule of Egypt while nominally remaining part of the Ottoman Empire if he withdrew from most of Syria. Muhammad Ali hesitated to accept the offer however and in September 1840 the European powers moved to engage Muhammad Ali's forces.