Gordon-Lennox was educated at Eton. He served in the Royal Navy between 1862<unk> 1965. 1867, he joined 1st Life Guards and, in 1867, transferred to Grenadier Guards. <unk> <unk> <unk> <unk> <unk> <unk>
<unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> He was the "Aide-de-Camp" to Prince George, Duke of Cambridge, 1883<unk>95. He served in South Africa in 1900 as Military Secretary to Sir Alfred Milner, and latterly on the staff of Hugh Trenchard, 1st Viscount Trenchard.