CHART OF TH£ NORTH SKA, SHOWING THE} LOCATION OF THF MINF BARRAGE LAID 

 BY THE} AMERICAN AND BRITISH MINING SQUADRONS 



When this mine barrage was found to be effective, Germany realized that her submarine 

 warfare had failed and that the ultimate defeat of her land forces was inevitable (see also' 

 detailed map of the mine field on page 109). 



86 



