Fegelein split the territory to be covered into two sections divided by the Pripyat River, with the 1st Regiment taking the northern half and the 2nd Regiment the south. The regiments worked their way from east to west through their assigned territory, and filed daily reports on the number of people killed and taken prisoner. By 1 August, SS Cavalry Regiment 1 under the command of Gustav Lombard was responsible for the death of 800 people; by 6 August, this total had reached 3,000 "Jews and partisans". Throughout the following weeks, personnel of SS Cavalry Regiment 1 under Lombards command murdered an estimated 11,000 Jews and more than 400 dispersed soldiers of the Red Army. Thus Fegeleins units were among the first in the Holocaust to wipe out entire Jewish communities. Fegeleins final operational report dated 18 September 1941, states that they killed 14,178 Jews, 1,001 partisans, 699 Red Army soldiers, with 830 prisoners taken and losses of 17 dead, 36 wounded, and 3 missing. Historian Henning Pieper estimates the actual number of Jews killed was closer to 23,700.. Over how many months did the 1st Regiment kill around 15000 Jews?