General Edmund von Glaise-Horstenau reported to the German Army Command OKW on 28 June 1941 : On 10 July , General Glaise-Horstenau added : A report ( to Gestapo chief Heinrich Himmler , dated 17 February 1942 ) on increased partisan activities stated that `` Increased activity of the bands is chiefly due to atrocities carried out by Ustaše units in Croatia against the Orthodox population . ''
A Gestapo report to Himmler ( 17 February 1942 ) on increased Partisan activities stated that `` Increased activity of the bands is chiefly due to atrocities carried out by Ustasha units in Croatia against the Orthodox population .