Observation balloon fatally pierced by incendiary bullets from American plane

Attaching observation balloon to winch for towing into position, Army of Occupation, Weissenburg, Germany

Through the uncharted heavens she blazed the trail, dirigible R-34 at Minneola

A double-seated "fighter" equipped with bomb-dropping device, ready to go aloft

Lieut. LeMaitre, French aviation forces, explaining "Nieuport" airplane, Fortress Monroe, Va.

Trench mortar in its well-timbered chamber, view looking straight down

A pioneer of the Kaiser's forests shattered into toothpicks by a shell from the Russian lines

Artillerymen who, between the Germans and the mud, are emplacing their guns with difficulty

German "pill boxes" and "strong points" which cost many lives to conquer

German steel cupola for machine guns, demolished by the Allies