a) Inflatable pontoons

During the Civil War, the Union Army employed an inventive method for building bridges quickly, utilizing inflatable pontoons. These pontoons, essentially large, cylindrical balloons made of canvas and rubber, could be filled with air or gas and used as floating supports for temporary bridges. This innovative approach allowed Union forces to rapidly construct bridges over rivers and other water bodies, facilitating the swift movement of troops and supplies. The use of inflatable pontoons showcased the ingenuity and adaptability of the Union’s military engineering during the war, significantly enhancing their operational mobility.