In August the commander of all Home Army units in the Wilno area, Gen. Aleksander Krzyżanowski "Wilk" ordered all six brigades under his command to prepare for the Operation Tempest – a plan for an all-national uprising against the German forces occupying Poland. In what became known as the Operation Ostra Brama, the V Brigade was to attack the Wilno suburb of Zwierzyniec in cooperation with the advancing units of the 3rd Belorussian Front. However, for fear of being arrested with his units by the NKVD and killed on the spot, Zygmunt Szendzielarz – Łupaszko – decided to disobey the orders and instead moved his unit to central Poland. The Operation Ostra Brama was a success and the city was liberated by Polish soldiers, but the Polish commander was then arrested by the Soviets and the majority of his soldiers were sent to Gulags and sites of detention in the Soviet Union.