In Moldavia, the Austro-Russian army under Suvorov and Saxe-Coburg soundly defeated the Turks at the Battle of Focșani on 1 August 1789. Charles-Joseph, 7th Prince of Ligne arrived in May to assume command of Semlin (Zemun), which is now part of Belgrade but was a separate town in 1789. Ligne noted that there was a truce in force at the time and that of his corps of 30,000 soldiers, only 15,000 were fit for duty because of sickness. Ligne complained in a letter that the truce allowed the Ottomans to bring food supplies into Belgrade. Marshal Hadik with the main army became seriously ill and had to be relieved of command. Emperor Joseph appointed Laudon to replace Hadik on 28 July. At this time the emperor wrote to Loudon, "Cost what it may. I want you to take Belgrade". Loudon arrived at Semlin on 14 August, met with the outgoing commander Hadik on the 16th, and conferred with the temporary commander François Sébastien Charles Joseph de Croix, Count of Clerfayt at Mehadia soon afterward. On 28 August the Ottomans attacked Mehadia but were driven off by Clerfayt.