28 Jan 1897 Surgeon-Lieutenant.
Malta Apr 1898 Arrived from Horfield, Bristol.
Nov 1898 Left for Crete, where he gallantly defended the hospital at Kandia when attacked by Moslem insurgents. The six honours conferred for services in Crete were well earned and thoroughly deserved; but the fact that no honours have been given for the trying fighting at Candia on 5 and 6 September has attracted considerable attention. That was of no ordinary character and called forth the highest qualities of our officers and men. Especially do we miss recognition of the gallant and admirable services of certain officers and men of the Royal Army Medical Corps.
On 4 Sept it was rumoured that an attack of certain moslems on British troops was likely. With rare prescience Lt Col Ryan RAMC the senior medical officer took steps to meet a surprise in a detached field hospital near the ramparts about three-quarters of a mile from the headquarters. Having obtained rifles and ammunition from the Highland Light Infantry, he armed
the 42 patients in the hospital and the 10 non-commissioned officers and men of the RAMC, and directed Lieutenant Leonard Addams Williams RAMC, to make such dispositions as might prevent the hospital being rushed, he himself having to return to headquarters. Captain Drury RMLI. in the journal of that corps of 7 December 1898, says:
Had not the Principal
Medical Officer (Ryan) on the previous day caused arms and ammunition to be conveyed to the hospital, it is certain beyond peradventure that that institution, with its patients, its medical staff and its corporal's guard, would have been utterly wiped out.
It is only necessary to recall that Lieutenant Williams and his men very gallantly defended the hospital under a galling fire from the ramparts and looped high houses overlooking it; how Lieutenant Clarke RAM C and eight volunteers sallied out and rescued Private McNeill HLI who was lying wounded on the ramparts, which cost the rescuers three killed and several wounded, including Clarke himself. It seems strange that such services should be unrecognised by honours, more especially since General Sir George White himself, at the St. Patrick's dinner in London, very highly eulogised Ryan's soldierly qualities in Crete.
Malta Apr 1899 Arrived from Crete.
Malta Jan 1900 Left Malta for Netley.
28 Jan 1900 Promoted Captain.
1900–1902 Served in South Africa.
28 Oct 1908 Major RAMC.
1 Mar 1915 Lieutenant Colonel RAMC.