text:  The Rhodesian attacks on ZANLA and <unk> bases did much to restore white morale following the Viscount incident , though they had not actually made much impact on the respective guerrilla campaigns . <unk> and the <unk> President Kenneth <unk> all the same requested further military aid and better weapons from the Soviets and the British respectively . Martial law was quickly extended across Rhodesia 's rural areas , and covered three @-@ quarters of the country by the end of 1978 . Air Rhodesia , meanwhile , began developing anti @-@ <unk> shielding for its <unk> . Before this work was completed , <unk> shot down a second Viscount , Air Rhodesia Flight <unk> , on 12 February 1979 . This time there were no survivors . 
  