drop in the number of frigates in the fleet, the Royal Navy was allowed to make the patrol intermittent. The patrol was finally eliminated on 25 June 1975, when Mozambique gained independence from Portugal and assured Britain that it would not allow transship oil to Rhodesia. The operation had cost more than 100 million pounds, and 76 Royal Navy ships took part in the operation. A total of 47 oil tankers were intercepted, of which 42 were allowed to proceed. Ships involved Ships involved in the patrol included: Aircraft carriers Destroyers Frigates Auxiliaries See also History of Zimbabwe United Nations Security Council Resolution 221 United Nations Security Council Resolution 232 References Further reading Beira Patrol units History of Mozambique Petroleum politics Military operations involving the United Kingdom Military operations involving Rhodesia Royal Navy patrols Beira, Mozambique History of Rhodesia International sanctions Rhodesia–United Kingdom relations Blockades