On 4 July 1964 ZANU insurgents ambushed and murdered a white foreman from Silverstreams Wattle Company, Pieter Johan Andries (Andrew) Oberholzer. The killing had a lasting effect on the small, close-knit white community, even though it was an isolated incident. The Smith administration subsequently moved to detain the ZANU and ZAPU political leadership in August 1964. The major political leaders imprisoned were Ndabaningi Sithole, Leopold Takawira, Edgar Tekere, Enos Nkala and Maurice Nyagumbo. The remaining military leaders of the ZANLA Dare ReChimurenga were Josiah Tongogara and the barrister Herbert Chitepo. Operating from bases in Zambia and later from Mozambique, militants subsequently began launching attacks against Rhodesia.