#7 Australian soldiers watch an observation balloon ascend over Ypres, Belgium, 1917.

Australian soldiers watch an observation balloon ascend over Ypres, Belgium, 1917.

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

#7 Australian soldiers watch an observation balloon ascend over Ypres, Belgium, 1917.

WWI

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