One of the engine cars or "power eggs" of a British dirigible 156
Crew of the C-5 (American coastal dirigible) starting for Newfoundland to make a transatlantic flight 157
Observers in the basket of an observation balloon 160
Enormous range-finders mounted on a gun turret of an American warship 161
British anti-aircraft section getting the range of an enemy aviator 176
A British aviator making observations over the German lines 177
Carrying on conversation by radio with an aviator miles away 192
Long distance radio apparatus at the Arlington (Va.) station 193
A giant gun concealed among trees behind the French lines 212
Observing the enemy from a papier-mâché replica of a dead horse 213
Camouflaged headquarters of the American 26th Division in France 220
A camouflaged ship in the Hudson River on Victory Day 221
Complex mass of wheels and dials inside a German submarine 240
Surrendered German submarines, showing the net cutters at the bow 241
A depth bomb mortar and a set of "ash cans" at the stern of an American destroyer 257
A depth bomb mortar in action and a depth bomb snapped as it is being hurled through the air 260
Airplane stunning a U-boat with a depth bomb 261
The same hatch opened to disclose the 3-inch gun and crew 268
A French hydrophone installation with which the presence of submarines was detected 269
Section of a captured mine-laying U-boat 272
A paravane hauled up with a shark caught in its jaws 273
A Dutch mine-sweeper engaged in clearing the North Sea of German mines 288
An Italian "sea tank" climbing over a harbor boom 300
Deck of a British aircraft mothership or "hush ship" 301
Electrically propelled boat or surface torpedo, attacking a warship 304
Hauling a seaplane up on a barge so that it may be towed 305
Lowering an armored diver into the water 320
A diver's sea sled ready to be towed along the bed of the sea 321
The sea sled on land showing the forward horizontal and after vertical rudders 321
The diving sphere built for deep sea salvage operations 324
For years the Germans had been preparing for war. The whole world knew this, but it had no idea how elaborate were their preparations, and how these were carried out to the very minutest detail. When the call to arms was sounded, it was a matter of only a few hours before a vast army had been assembled--fully armed, completely equipped, ready to swarm over the frontiers into Belgium and thence into France. It took much longer for the French to raise their armies of defense, and still longer for the British to furnish France with any adequate help. Despite the heroic resistance of Belgium, the Entente Allies were unprepared to stem the tide of German soldiers who poured into the northern part of France.