In the 1863-70 decade the heavy use of railways in the American Civil War, and in Germany's wars against Austria and France, provided a speed of movement unheard-of in the days of horses. During much of the 20th century, rail was a key element of war plans for rapid military mobilization, allowing for the quick and efficient transport of large numbers of reservists to their mustering-points, and infantry soldiers to the front lines. The Western Front in France during World War I required many trainloads of munitions a day. Rail yards and bridges in Germany and occupied France were major targets of Allied air power in World War II.