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These missions were not without loss to the hunters. At approximately 0300 on 21 February, four pilots and crew from the 160th SOAR and three Delta operators were killed when an MH60 helicopter crashed into a sand dune during zero-visibility weather conditions near the Ar Ar airfield. The ground team was reportedly conducting counterforce operations when one of the team was injured in a fall from a cliff and required medevac, to which the 160th responded. Similarly, one eight-man SAS team was compromised while on a reconnaissance mission. Four of these troopers died during escape-and-evasion after they were engaged by subsequent Iraqi patrols. Commandos from both groups were injured in firefights with Iraqi forces on a number of occasions in addition to casualties from exposure to unexpectedly cold nighttime weather.

the above is what seems to be described in Andy McNab's "Bravo Two Zero".