With the merger of Tanganyika and Zanzibar on 23 April, there were concerns that the Umma Party would stage a coup; Operation Shed was designed to provide for intervention should this happen. Shed would have required a battalion of troops, with scout cars, to be airlifted to the island to seize the airfield and protect Karume's government. However, the danger of a revolt over unification soon passed, and on 29 April the troops earmarked for Shed were reduced to 24 hours' notice. Operation Finery was cancelled the same day. Concern over a possible coup remained though, and around 23 September Shed was replaced with Plan Giralda, involving the use of British troops from Aden and the Far East, to be enacted if the Umma Party attempted to overthrow President Julius Nyerere of Tanzania. An infantry battalion, tactical headquarters unit and elements of the Royal Marines would have been shipped to Zanzibar to launch an amphibious assault, supported by follow-on troops from British bases in Kenya or Aden to maintain law and order. Giralda was scrapped in December, ending British plans for military intervention in the country.