The uprising also coincided with the stalling of the Soviet summer offensive, the failure of the Warsaw Uprising, and other troubles on the side of the Western allies. The Red Army and its Czechoslovak allies failed to quickly penetrate the Dukla Pass despite fierce fighting between 8 September and 28 October; they suffered 85,000 casualties (21,000 dead). The Czechoslovak government in exile failed to convince Western allies to ignore Stalin's obstructionism and send more supplies to the area.