They were used for reconnaissance of troops in the civil war. They were the first type of "spy" from the air.
Hot air balloons were used for reconnaissance during the civil war.
no
The Civil war
bbksu
The first use of hot air balloons was in the American Civil War for surveillance of troop movements.
To spy on the enemy
the civil war of which country?
telegraphs hot air balloons spies/couriers telegraphs hot air balloons spies/couriers
Hot air balloons
Hot air balloons
Yes. The Union and the Confederate armies both used them for spying during the Civil War.
both sides used it to spy on each other