under army or Waffen-SS command. In the Autumn of 1941, they left the anti-partisan role to other units and actively took part in The Holocaust. While assisting the Einsatzgruppen, they participated in the extermination of the Jewish population of the Soviet Union, forming firing parties when required. The three brigades were responsible for the murder of tens of thousands by the end of 1941. Because it was more mobile and better able to carry out large-scale operations, the SS Cavalry Brigade had 2 regiments with a strength of 3500 men and played a pivotal role in the transition to the wholesale extermination of the Jewish population. In the summer of 1941, Himmler assigned Hermann Fegelein to be in charge of both regiments. On 19 July 1941, Himmler assigned Fegelein's regiments to the general command of HSSPF Erich von dem Bach-Zelewski for the "systematic combing" of the Pripyat swamps, an operation designed to round up and exterminate Jews, partisans, and civilians in that area of Byelorussian SSR. 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 Lombard's command murdered an estimated 11,000 Jews and more than 400 dispersed soldiers of the Red Army. Thus Fegelein's units were among the first in the Holocaust to wipe out entire Jewish communities. Fegelein's 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. 1942 1942 expansion In 1942, the Waffen-SS was further expanded and a new division was entered on the rolls in March. By the second half of 1942, an increasing number of foreigners, many of whom were not volunteers, began entering the ranks. The 7th SS Volunteer Mountain Division Prinz Eugen was recruited from Volksdeutsche (ethnic