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Admiral of the Fleet Sir Henry Bradwardine Jackson, was a British Royal Navy officer. After serving in the Anglo-Zulu War he established an early reputation as a pioneer of ship-to-ship wireless technology. Later he became the first person to achieve ship-to-ship wireless communications and demonstrated continuous communication with another vessel up to three miles away. He went on to be Third Sea Lord and Controller of the Navy, then Director of the Royal Naval War College and subsequently Chief of the Admiralty War Staff. He was advisor on overseas expeditions planning attacks on Germany's colonial possessions at the start of the First World War and was selected as the surprise successor to Admiral Lord Fisher upon the latter's spectacular resignation in May 1915 following the failure of the Gallipoli Campaign. He had a cordial working relationship with First Lord of the Admiralty Arthur Balfour, but largely concerned himself with administrative matters and his prestige suffered when German destroyers appeared in the Channel, as a result of which he was replaced in December 1916.