Why the Hindenburg Line Seemed So Impregnable 



The victorious British have unearthed the se- 

 cret of the strength of the Hindenburg line. It 

 lay in concealed forts of solid cement hidden in 

 the most ingenious ways. In the top picture 

 one is seen built so as to seem part of a ruin 



One fort discovered by the British was built 

 under an old barn. It was covered over with 

 grass and was entered by means of the ladder 

 and pulley arrangement shown above. It 

 was used as a station for a machine gun 



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