between the French and Prussians, and was distressed that wounded soldiers were not picked up by the numerous ambulances (which regulations required to be stationed two and half miles back from the scene of battle) until after hostilities had ceased, so he set about developing a new ambulance system. Having decided against using the Norman system of horse litters, he settled on two- or four-wheeled horse-drawn wagons to transport fallen soldiers from the (active) battlefield "after" they had received early treatment in the field. Larrey adapted the axle assembly from the French army's horse-drawn artillery ("flying artillery" – "") that made their gun carriages especially maneuverable on uneven terrain, and so christened his ambulances "flying ambulances" ("ambulances volantes"). The flying ambulances were first used by the Army of the Rhine in 1793. Larrey subsequently developed similar services for Napoleon's armies, and adapted his ambulances to the conditions; including developing a litter which could be carried by a camel for the 1798-1801 French campaign in Egypt.