On 29 June 1941 Frikorps Danmark (Free Corps Denmark) was founded as a corps of Danish volunteers to fight against the Soviet Union. Frikorps Danmark was set up at the initiative of the SS and National Socialist Workers' Party of Denmark (DNSAP) who approached Lieutenant-Colonel C.P. Kryssing of the Danish army shortly after the invasion of the USSR had begun. According to Danish law, it was not illegal to join a foreign army, but active recruiting on Danish soil was illegal.