Technological innovations during the war had a great impact on 19th-century science. The war was an early example of an "industrial war", in which technological might is used to achieve military supremacy. New inventions, such as the train and telegraph, delivered soldiers, supplies and messages at a time when horses had been the fastest way to travel. It was also in this war that aerial warfare, in the form of reconnaissance balloons, was first used. It saw the first action involving steam-powered ironclad warships in naval warfare history. Repeating firearms such as the Henry rifle, Spencer rifle, Colt revolving rifle, Triplett & Scott carbine and others, first appeared during the Civil War; they were a revolutionary invention that would soon replace muzzle-loading and single-shot firearms. The war saw the first appearances of rapid-firing weapons and machine guns such as the Agar gun and Gatling gun.