From Thriller Picture Library #439, January 1963.
The lone Frenchman in the Foreign Legion in Algeria had written a letter asking for help from John Steel but before he could mail it, he was snatched from a cafe by member of the Grey Commandos and hauled away to answer to 'the Colonel'. His letter was picked up by a young woman and mailed anyways. The unfortunate man had been an old friend of Steel and the letter talks of his having joined the Legion to find a traitor, former SS Colonel Spadl, the Butcher of Bordeaux, reported dead years before.