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

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