On 25 May, 54 Battalion crossed the border into Angola and started securing the route of advance that the other battle groups would take in the following weeks. 54 Battalion secured the area up to Mulemba, which was 90 km into Angola, thereby establishing the
HAA and staging area. During this period leading up to D-day, the group came into contact with PLAN soldiers and destroyed caches, losing two men with one missing in action, and secured the route by 9 June. By 1 June, the remaining three battle groups began to train and conduct mock simulated attacks on the planned targets at various bases in SWA/Namibia. On 7 June, SAAF conducted two attacks, the first by
Mirages on the PLAN base near
Lubango in which two Mirages were damaged and the second attack at "Smokeshell" by Mirages and
Buccaneers where no resistance was encountered. Training finally ended and the three battle groups met up at
Eenhana on 9 June. In the early morning of 10 June, the three battle groups left Eenhana and advanced towards Mulemba and the staging area. By 08h00, SAAF consisting of Mirages, Buccaneers and
Impala's attacked various targets at "Smokeshell", Mulola and Ondova which would become the targets of the battle groups later in the afternoon. This time PLAN was prepared and anti-aircraft fire was received by the SAAF Mirages over "Smokeshell" from
23 mm AA guns and
SA-7 missile fire. Due to the failure of the arrival of aviation fuel at the HAA, the helicopters were unable to deploy SADF troops to stop the retreat of any fleeing soldiers from "Smokeshell". Battle Group 53 attacked the PLAN positions east of Mulemba while Battle Groups 61 and 10 headed towards Chitumba attacking "Smokeshell" later than planned, around 14h30. Initially the defenders were caught by surprise, but regrouped and fought back. What was supposed to be above ground defences turned out to be camouflaged bunkers and trenches. Elements of Battle Group 61 came under 23 mm AA fire, used in a ground attack role, that caused damage to several
Ratel's, resulting in South African casualties in those vehicles and to soldiers attempting to escape them. By nightfall the Battle Groups 61 and 10 had to withdraw. The attacks resumed in the morning of 11 June, with the South Africans attacking and clearing the now empty bases. On withdrawing that evening, only 10 percent of the bases were cleared. The target was spread over thirteen bases, covering over forty five square kilometres. Battle Group 10 was due to attack at Mulola, but had been called in to assist Battle Group 61. That attack was postponed until 14 June, but PLAN withdrew on 12 June, with the SADF stopper groups failing to prevent the withdrawal. Consequently, by the time Battle Group 10 arrived, it was deserted. On 29 June, Battle Group 10 was attacked by FAPLA troops as it was withdrawing to South West Africa/Namibia. The SAAF was called to assist and FAPLA forces were attacked and forced to withdraw. By 1 July, all SADF forces had crossed back into SWA/Namibia. ==Aftermath==