On August 17 the advance of Budionny's Cavalry Army toward Lwów was halted at the Battle of Zadwórze, where a small Polish force sacrificed itself to prevent Soviet cavalry from seizing Lwów and stopping vital Polish reinforcements from moving toward Warsaw. On 29 August Budionny's cavalry moving through weakly defended areas reached city of Zamość and attempted to take the city in the Battle of Zamość, but was soon facing increasing number of Polish units which could be spared from the successful Warsaw counteroffensive. On August 31 Budionny's cavalry finally broke off their siege of Lwów and attempted to come to the aid of Russian forces retreating from Warsaw, but were intercepted, encircled and defeated by Polish cavalry at the Battle of Komarów near Zamość, the greatest cavalry battle since 1813 (and one of the last cavalry battles ever). Budonny's Army managed to avoid encirclement, but its morale plummeted down. What was left of Buidonny's 1st Cavalry Army retreated towards Włodzimierz Wołyński on 6 September and was soon again defeated at the Battle of Hrubieszów. Suwalszczyzna was recaptured from the Lithuanian forces.