100 60 tern of sentinels Ls maintained; to accomplish the second a well-integrated system of obstacles, always defended by antitank and small-arms fire, is used. The small-arms fire prevents the removal of the obstacles by enemy engineers.
Rond-block mine fletd.
Figitre 1C9—Tank stopped by antitank ditch
Fiaua* i 10.—Tank stopped by log wall
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