Born 28th March 1879,son of William Costeker. He was educated at Harrow and Sandhurst, and entered the Army 3rd August 1898, as a Second Lieutenant in the Royal Warwickshire Regiment., in which he was promoted Lieutenant 3rd February 1900.
He served in the South African War, 1901-02 as Adjutant, Mounted Infantry Battn., Sept. 1901, to May 1902; was present during operations in Cape Colony, Feb. to May 1901; in Orange river Colony, May, 1901 to March, 1902; also in the Transvaal, March to 31st May, 1902.
He was mentioned in despatches (London Gazette, 17 Jan 1902; received the Queen's medal with five clasps.
He was created a Companion of the Distinguished Service Order, (London Gazette 28 Jan 1902);"John Henry Dives Costeker, Lieut., The Royal Warwickshire Regiment. For the capture of Commandant Kolde 11 Nov, 1901"
He was invested by the King 12 Nov. 1902.
He was promoted Captain 3 June 1903; was Adjutant of the Royal Warwickshire Regt. 27 June 1904, to 11 april 1907; became Garrison Adjutant., Eastern Command, 1 June 1907; Staff Captain, Irish command, 1914.
He was killed in action at the Dardanelles on 25th April 1915, whilst serving as Brigade Major, 88th Infantry Brigade.
He married on 9th June 1914, Margaret, daughter of Percy C. Morris.
His grave was visited by the Prince of Wales on the 24th April 2005 during the Prince's visit to Gallipoli to mark the 90th Anniversary.
Major, Royal Warwickshire Regiment. Age: 36.
Awarded Distinguished Service Order
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