Operation Grapple was the name of four series of British nuclear weapons tests Testing of early atomic bombs and hydrogen bombs Attack carried out Action in 1957 and 1958 at Malden Island and Kiritimati ( Christmas Island ) in the Pacific Ocean as part of the British hydrogen bomb programme .

During early August 1945 , the cities of Hiroshima and Nagasaki were struck Attack and mostly destroyed Destroying by atomic bombs .