Just found this on a website about the Zulu war.

"Maj.-Gen. William Frederick Cavaye was born on 15th February 1845 at Edinburgh, Midlothian, Scotland. He was the son of General William Cavaye and Isabella Hutchinson. He married Ada Mary Barttelot, daughter of Sir Walter Barttelot, 1st Bt. and Harriet Musgrave, in December 1882 at Petworth, Sussex, England. He died on 30th January 1926 at age 80 at 6 Neville Terrace, Kensington, London, England.

Maj.-Gen. William Frederick Cavaye was educated in 1857 at Edinburgh Academy, Edinburgh, Midlothian, Scotland, Public School. He was commissioned in 1861 with the rank of Ensign 107th, in the service of the Regiment of Foot. He fought in the Anglo-Zulu War in 1879. He fought in the Boer War between 1899 and 1902, where he was mentioned in despatches. He was Served as Councillor in 1906 at Kensington Borough Council, Kensington, London, England. He held the office of Mayor of Kensington between 1907 and 1909.2 He fought in the First World War between 1917 and 1919, with the British Expeditionary Force in France. He gained the rank of Major-General in the service of the Royal Sussex Regiment. He lived at Birchenbridge, Horsham, Sussex, England."

There's no guarantee that its the right man but its very tempting to think so. The dates would certainly match.