The Rhodesian army continued its "mobile counter-offensive" strategy of holding key positions ("vital asset ground") while carrying out raids into the no-go areas and into neighbouring countries. These raids became increasingly costly and unproductive. For example, in April 1979 special forces carried out a raid on Joshua Nkomo's residence in Lusaka (Zambia) with the stated intention of assassinating him. Nkomo and his family left hastily a few hours before the raid – having clearly been warned that the raid was coming. Rumours of treachery circulated within Rhodesia. It was variously suggested that the army command had been penetrated by British MI6 or that people in the Rhodesian establishment were positioning themselves for life after independence. The loyalty of the country's Central Intelligence Organisation became suspect.