After the French Revolution, the new rulers became interested in using the balloon to observe enemy manoeuvres and appointed scientist Charles Coutelle to conduct studies using the balloon L'Entreprenant, the first military reconnaissance aircraft. The balloon found its first use in the 1794 conflict with Austria, [citation needed] where in the Battle of Fleurus the gathered information and the demoralizing effect on the Austrian troops ensured victory for the French troops. After the invention of photography, primitive aerial photographs were made of the ground from manned and unmanned balloons.