The Boer War and the First World War played a part in the revival of the refounded school with the growing importance of Portsmouth in wartime as a naval port, dockyard and garrison town. Science and technical education became an increasingly important part of the curriculum.

In the Boer War, more than half of the 50 Old Portmuthians who had served as officers received awards for gallantry, including  Lieutenant William Harry Nickerson of the Royal Army Medical Corps who won the Victoria Cross for his bravery in treating an injured man under fire.

The majority of the 129 Old Portmuthians killed in the First World War were in their teens and early twenties. The ranks ranged from private to brigadier-general and gallantry awards included two VCs. Lieutenant Norman Holbrook was the first submariner to receive the highest award for bravery, and Major Francis Harvey of the RMLI who saved his ship while mortally wounded. 

Staff list 1911,  Headmaster J C Nicol 

Staff list 1922, Headmaster C J Whitmore