The half of B squadron in al-Jauf, Saudi Arabia, were given the task of establishing covert observation posts along the MSR in three-eight-man patrols inserted by helicopter. On 22 January three eight-man patrols from B Squadron were inserted behind the lines by a Chinook helicopter. Their mission was to locate Scud launchers and monitor the main supply route. One of the patrols, Bravo Two Zero, had decided to patrol on foot. The patrol was found by an Iraqi unit and, unable to call for help because they had been issued the wrong radio frequencies, had to try to evade capture by themselves. The team under command of Andy McNab suffered three dead and four captured; only one man, Chris Ryan, managed to escape to Syria. Ryan made SAS history with the "longest escape and evasion by an SAS trooper or any other soldier", covering more than SAS trooper John 'Jack' William Sillito, had in the Sahara Desert in 1942. The other patrols, Bravo One Zero and Bravo Three Zero, had opted to use landrovers and take in more equipment returned intact to Saudi Arabia.