Excellent piece on Counter-Insurgency Tactics.
While the Rhodesian forces never really developed a successful antidote to the guerrillas’ mobilization of the masses, they displayed consummate skill in defeating the guerrillas in combat. Even low-calibre units such as the Police Field Reserve could easily repel guerrilla attacks, though the insurgents tended to be more aggressive against units such as Guard Force and Internal Affairs.
In the years 1966-72, guerrilla activity, no matter how small the group, would invite the full attention of regular units and the Rhodesian Air Force. Insurgents were rapidly followed up by helicopter-borne patrols, and if they failed to re-cross the frontier were almost invariably hunted down. But from 1972 both the size and geographical spread of guerrilla incursions rapidly expanded. From 1976 every area of the country became affected by guerrilla operations. There were simply not enough well-trained Rhodesian soldiers to cover all the ground, and as increasing reliance was put on reserves, the problem of pinning down guerrillas so that they could be eliminated by superior firepower and tactics became acute.
Read more here via