He spent the period from September 1940 to May 1941 serving in
West Ham, one of the most heavily bombed areas in the country. The first day of
the Blitz (7 September 1940), Demarne recalled a "lovely sunny day. It was about There were about 300 German aircraft. Some detached and flew along the waterfront from North Woolwich to the tidal basin, bombed the big factories along the
River Thames". The first raid was followed by 57 consecutive nights of bombing; after one night off, when the German aircraft were hampered by bad weather, the air raids resumed until 10 May 1941. The night of 29/30 December 1940 was one of the most destructive
air raids of the London Blitz and was quickly dubbed
The Second Great Fire of London. The Auxiliary Fire Service worked almost continuously, putting out fires and rescuing the injured and recovering the dead from the ruined buildings. Demarne was appointed Company Officer at
Whitechapel in October 1941, in the new
National Fire Service. He was twice promoted in 1943. In January 1944, as Divisional Officer, he was transferred back to
West Ham in time for the "Baby" Blitz and
flying bomb attacks. He described how one night in
Forest Gate a bus laden with people going home from work was hit. "The top of the bus was completely gone with the remains of the passengers scattered over nearby houses. The passengers on the lower deck had all been decapitated but were sitting in their seats "as if waiting to have their fares collected. It was the most horrific thing I witnessed". He was transferred again to the
City and Central London in November 1944, where he was involved in three of the most deadly
V-2 rocket attacks, in which more than three hundred people were killed. ==Post-war career==