After a Hungarian-Czechoslovak cease-fire signed on 1 July 1919, the Hungarian Red Army left parts of Slovakia by 4 July, as the Entente powers promised to invite a Hungarian delegation to the Versailles Peace Conference. In the end, this particular invitation was not issued. Béla Kun, leader of the Hungarian Soviet Republic, then turned the Hungarian Red Army on the Romanian Army and attacked at the Tisza river on 20 July 1919. After fierce fighting that lasted some five days, the Hungarian Red Army collapsed. The Royal Romanian Army marched into Budapest on 4 August 1919.