The German field commanders argued for an immediate offensive towards Moscow, but Hitler over-ruled them, citing the importance of Ukrainian agricultural, mining and industrial resources, as well as the massing of Soviet reserves in the Gomel area between Army Group Centre's southern flank and the bogged-down Army Group South's northern flank. This decision, Hitler's "summer pause"is believed to have had a severe impact on the Battle of Moscow's outcome, by slowing down the advance on Moscow in favour of encircling large numbers of Soviet troops around Kiev. Hitler then decided to resume the advance on Moscow, re-designating the panzer groups as panzer armies for the occasion Operation Typhoon, which was set in motion on 30 September, saw the 2nd Panzer Army rush along the paved road from Oryol (captured 5 October) to the Oka River at Plavsk, while the 4th Panzer Army (transferred from Army Group North to Centre) and 3rd Panzer armies surrounded the Soviet forces in two huge pockets a