Operation Overload was undertaken to block what appeared to be an advance by ZANLA insurgents from the Chiweshe Tribal Trust Land towards the Rhodesian capital of Sailsbury during early 1974. The residents of these areas had previously been subjected to collective punishment by the Rhodesian government in 1973 in a failed attempt to deter them from supporting the insurgents.
As part of the operation, all the 49,960 residents of the Chiweshe Tribal Trust Land were forced to move into 21 protected villages. The Rhodesian Army and Police transported the civilians to their new villages, where they were required to construct new homes with materials salvaged from their previous homes. All of the huts in the evacuated areas where then destroyed by the Rhodesian Security Forces. The civilians who were forced to move did not receive any compensation.
Residents of the northern part of the Chiweshe Tribal Trust Land were generally willing to move voluntarily into the protected villages as they had been intimidated by the insurgents. Many residents of the southern part of the Chiweshe Tribal Trust Land resisted the forced relocations.
The relocations were completed on 15 August 1974. All of the protected villages had inadequate sanitation facilities, which led to disease, and they were not well protected from the insurgents.
"In the short term, benefits seemed substantial," says Cilliers, "as insurgent activities were severely disrupted in Chiweshe for the following six months". The security forces immediately set about a similar operation called Overload Two in the Madziwa Tribal Trust Lands. This involved 13,500 civilians being relocated into eight protected villages.