With the nation increasingly pressured by sanctions, the Rhodesian government offered an amnesty to the nationalist guerrillas operating in the field in March 1979, printing and distributing 1.5 million leaflets entitled: "TO ALL ZIPRA FORCES". The leaflets were printed with the signatures of Prime Minister Ian Smith, the ZANU founder Ndabaningi Sithole, United African National Council leader Abel Muzorewa, Chief Jeremiah Chirau, and Walls. Any who abandoned the Bush War were offered suffrage, food and medical treatment. Following this in April 1979 Walls issued an order to the Selous Scouts Regiment to train, organise, and support militants who had defected to the Rhodesian government's authority as part of "Operation Favour". However this hearts and minds approach had only limited success, and the Bush War continued unabated. Following the Internal Settlement, Zimbabwe Rhodesia's government concluded a ceasefire with the Patriotic Front ahead of negotiations in London.