1st ed., xvi,238pgs, 12pgs of half-tone illusts; & 10 maps & diagrams, orig cloth in d/w. V.good copy. Tells the story of how Britian planned & executed a mission to rid the seas of German U-Boats, which had, during April 1917 destroyed 621,645 tons of Allied & neutral shipping.
1st ed., xvi,238pgs, 12pgs of half-tone illusts; & 10 maps & diagrams, orig cloth in d/w. V.good copy. Tells the story of how Britian planned & executed a mission to rid the seas of German U-Boats, which had, during April 1917 destroyed 621,645 tons of Allied & neutral shipping.