With the Eastern Front entering Polish territories in 1944, the Home Army established an uneasy truce with the Soviets. Even so, the main Red Army and NKVD forces conducted operations against Home Army partisans, including during or directly after Poland's Operation Tempest, which the Poles had envisioned to be a joint Polish–Soviet operation against the retreating Germans which would also establish Polish claims to those territories. The Home Army helped Soviet units with scouting assistance, uprisings, and assistance in liberating some cities (e.g., Operation Ostra Brama in Vilnius, and the Lwów Uprising), only to find that Home Army troops were arrested, imprisoned, or executed immediately afterwards. Unbeknownst to the Poles, Operation Tempest had been fatally flawed from the start due to Joseph Stalin's intention of ensuring that an independent Poland would never re-emerge after the war.