National Geographic : 1940 Feb
278 THE NATIONAL GEOGRAPHIC MAGAZINE © A. B. C. Press from Black Star SPRAY "GOES OVER THE TOP" WHERE TRENCHES GUARD AGAINST LANDING PARTIES FROM THE SEA In much of the Netherlands, such military trenches cannot be used because of the low, moist ground. Only in the coastal sand dunes and in relatively high ground in the east and south are they feasible. Photograph by de Haas from Three Lions PEACE-LOVING NETHERLANDS PREPARES TO DEFEND ITSELF Here, amid sandbags, Amsterdam residents read their country's call to a protective mobilization.