Why did the Warsaw Uprising fail?

The Warsaw Uprising (August–October 1944) failed primarily due to a lack of sufficient military support and the strategic isolation of the Home Army forces.1

While the Polish underground successfully regained control of much of the city in the initial days, they failed to capture critical transportation and communication arteries. As the conflict shifted into a prolonged siege, the better-equipped German forces gained the upper hand.1

Several external factors contributed to this defeat:
* Soviet Inaction: Although the Red Army had encouraged the uprising, they remained idle across the Vistula River while the Germans counterattacked.1
* Denied Allied Support: The Soviet government refused to allow Western Allies to use Soviet air bases for resupply missions. Long-range flights from Italy suffered extraordinary losses, and the limited aid eventually provided by the Soviets arrived too late to be effective.1

Ultimately, the uprising's failure allowed the Germans to destroy the city and eliminate the military organization supporting the Polish government-in-exile, facilitating the establishment of Soviet political control over Poland.1