#12 An observation balloon is prepared for ascent in Ypres, Belgium, 1917.

An observation balloon is prepared for ascent in Ypres, Belgium, 1917.

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

#12 An observation balloon is prepared for ascent in Ypres, Belgium, 1917.

WWI

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