#20 An observation balloon is inflated near Ypres, Belgium, 1917.

An observation balloon is inflated near Ypres, Belgium, 1917.

Military Observation Balloons of WWI: Before Satellites And Drones, these Hot Air Balloons Were Used For Surveillance

#20 An observation balloon is inflated near Ypres, Belgium, 1917.

WWI

Related posts:

#33 A woman shaping a steel knee splint at the Kensington War Hospital supply depot, 1917.

#77 Two white horses pull a cart full of coal with a man shoveling the coal

#72 Two men holding rifles with bayonets run forward

#48 This general view shows German shock troops about to advance at the western front during World …

#11 British women painting planes at aeroplane factory near Birmingham

#17 Night Flight at Le Bourget, France.

#68 Women cleaning windows.

#47 A Red Cross flag is affixed to a tree.

#44 German troops advancing in Ham, France.