 The transition got off to a shaky start because, contrary to SWAPO leader Sam Nujoma's written assurances to the UN Secretary-General to abide by an agreed cease-fire and repatriate from Angola only unarmed Namibians, the South Africans alleged that approximately 2,000 armed members of the People's Liberation Army of Namibia (PLAN), SWAPO's military wing, crossed the border from Angola in an apparent attempt to establish a military presence in northern Namibia.Under pressure from AG Pienaar and South Africa's foreign minister Pik Botha, UNTAG's Martti Ahtisaari took advice from British Prime Minister, Margaret Thatcher, who was visiting Southern Africa at the time, and authorised a limited contingent of South African troops to aid the South West African Police (SWAPOL) in restoring order.A period of intense fighting followed, during which 375 PLAN fighters were reported to have been killed.