The Nazi administration brought in Reinhard Heydrich as Deputy Protector of Bohemia and Moravia in order to enforce policy more harshly. His brutality led to the Allies ordering his assassination in May 1942. In the violent crackdown that followed, known in Czech as the Heydrichiáda, more than a thousand Czechs were murdered, including the entire village of Lidice. Some former members of the resistance evaded arrest by fleeing into the Moravian mountains and forming partisan groups. The first documented partisan group was the Green Cadre (), active in the Hostýn-Vsetín Mountains along the Czech-Slovak border from early 1942. There were also urban resistance groups, such as the White Lioness () active in the areas of Silesia around Frýdek-Místek and Ostrava. Such partisan groups depended on the support of the local population and acted by cutting power lines and sabotaging railways. Beginning in April 1944, several paratrooper groups trained in Britain were dropped in Moravia in order to gather intelligence.