The Rhodesian Special Air Service, one of the most formidable fighting forces in the world, operated almost exclusively across borders during the long bitter bush war, undertaking deep-penetration missions against insurgents being harbored inside neighboring Mozambique and Zambia. There were missions into Botswana too, and at one stage, the SAS was operating without benefit of passport in all three neighboring territories at the same time. Long before the war escalated and the whole region became their battlefield, clandestine missions across the border were undertaken by SAS operators. Later, when the situation intensified, they were responsible for some of the most audacious and highly sensitive missions of the war.