“We overtook quite a few people in the downhill – although I'm black and blue from falling in the giant slalom.
"We were lucky to be trained by Simon Grove, an ex-military policeman who has done the Inferno a dozen times.”
Langlauf is a particular challenge for anyone restricted to using a single arm, as the sport relies on poling. In the 6km (3.7-mile) race, each of them snapped a ski pole, making progress even trickier.
“We did three circuits of the village at 6am every morning to practise, but I think we still set a new record for the number of falls,” said Pte van Gass. The 25 year-old learnt to ski two years ago – a turning point in his rehabilitation – but had not langlaufed before last week.
The pair will travel to the Himalayas in March ahead of their Everest attempt.
Another sporting great to race the downhill part of the Inferno on Saturday was Sir Steve Redgrave, who recorded a time of 15 minutes and 22 seconds.