For many hundreds of years the valley of the Rhine itself, and the various valleys adjacent, were the haunt of numerous bodies of rapacious and desperate banditti. The rugged, mountainous nature of the country naturally made lawlessness the more easy there, and till so late as the beginning of the nineteenth century these gangs of robbers were a constant menace to the traveller in Rhineland. At the time of the French Revolution, indeed, and for some decades thereafter, the district was literally infested with thieves; for the unsettled state of Europe at this date perforce tended to bring desperadoes from far and near, and for a while the inhabitants of the different villages on the banks of the Rhine endured a veritable reign of terror. But almost from the outset the brigands realized that they would soon be undone if they grew too numerous. They knew that, in that event, strong military measures would probably be taken against them; so they made every effort to practise that union which is proverbially strength, and to prevent the enlisting in their ranks of anyone likely to prove cowardly or perfidious. In some cases, too, they actually had a well and capably organized system whereby one of their number could escape quickly, if need be, from the scene of his crime; for, like the French prisoners described in Stevenson's St. Ives, they had a line of sanctuaries extending perhaps into Austria or Italy, the retreat in most instances being an inn whose keeper was sworn to hide and protect his robber guest at all costs. In short, there was honour among these thieves, and even a certain spirit of freemasonry; while, more important still, the captain of a band was very often in league with the few police officials of the neighbourhood.