There is an interesting account of one man's escape through the Pyrennees in "Wavetops at my Wingtips", by the late Les Baveystock. His escape and evasion was aided by both the Belgians and French, after he had been the last man out of Les Manser VC's burning Manchester.
Baveystock later went on to Sunderlands, and was creditted with sinking two U-Boats.
A very fine read...