Hogg was awarded the first of his two
Distinguished Service Crosses (DSC) for his efficiency and coolness as a navigator under the trying circumstances of the evacuation of
Crete in May and June 1941. The Germans had intended to take Crete with combined airborne and seaborne attacks. Although the Royal Navy was able virtually to annihilate the seaborne component, which carried much equipment in local caïques, the German paratroops—though at great loss to themselves—forced the under-equipped British forces, many of whom were still in shock after being driven out of Greece, into another evacuation. Air attacks by an almost unopposed and expert
Fliegerkorps VIII around Crete cost the British three
cruisers and six
destroyers sunk, with an
aircraft carrier, two
battleships, five cruisers and seven destroyers badly damaged, bringing the
Mediterranean Fleet almost to breaking point. The
Commander-in-Chief, Admiral
Sir Andrew Cunningham, was adamant that while ships were replaceable, the reputation of the Royal Navy was not, and that the evacuation of soldiers should continue to the limit. In the event 18,000 troops were rescued. As the
flotilla operations and navigating officer to Captain Stephen Arliss in the
Royal Australian Navy destroyer
Napier, Hogg was responsible on 28–29 May for organising hazardous feats of navigation on an unlit and badly charted coast near
Sfakia in southwest Crete for his ship and the destroyers
HMS Nizam,
HMS Kelvin and
HMS Kandahar. Only two
motorboats and four unpowered
whalers were available to embark 700 men and, at the same time, land 15,000 badly needed rations for those troops still fighting onshore. The need to make best use of available darkness required the anchorage for this operation to be perilously close inshore. On 30 May, reduced to only two ships through damage and defects but using abandoned landing craft to supplement these,
Napier and
Nizam saved more than 1,400 troops. Hogg received praise for his cool, calm and cheerful demeanour and his very good advice when the force came under intensive air attack on 31 May, during which
Napier was damaged in the engine room by a near miss. Hogg stayed with the
Napier as the senior staff officer to Captain Arliss, who became the
commodore in command of Admiral Somerville's
Eastern Fleet destroyers, based in
Ceylon, until early 1944. As the navigating and signals officer of the cruiser
HMS Mauritius in August 1944, Hogg was awarded a
Bar to his DSC for his outstanding zeal during prolonged and violent night actions against escorted enemy convoys close inshore near
La Rochelle and the
Ile d'Yeu. His captain remarked that Hogg was "cool, calm and collected and afforded advice that enabled us to take risks which with a less resolute and skilful officer would not have been justified". Hogg was known as a good-looking man. It is recorded that during the war when Mauritius was refitting in
Liverpool and a drink was difficult to come by, his companions would always "put Ian into bat first with the barmaid"—with invariably satisfactory results. In 1945 he married Mary Marsden within three months of having met her in Liverpool on a Monday and becoming engaged on the Saturday. ==Post-war service==