#13 An officer prepares to ascend in an observation balloon near the ruins of Ypres, Belgium, 1917.

An officer prepares to ascend in an observation balloon near the ruins of Ypres, Belgium, 1917.

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

#13 An officer prepares to ascend in an observation balloon near the ruins of Ypres, Belgium, 1917.

WWI

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