When the Vichy France authorities captured Garrow in October 1941, Guérisse took over as chief of the escape network. Along with others such as Nancy Wake, he smuggled a German uniform to Garrow in his cell in Mauzac concentration camp, which helped Garrow's escape on 6 December 1941. At this point the British decided it was time for Garrow to return to London, so O'Leary continued in command and expanded the reach of the escape line's operations. The line carried over 600 escapees to Spain and back to Britain.