The first bicycles were introduced into the armed forces of several nations in the late 19th century; by the time the start of World War I, the German Army had 36 independent companies of bicycle infantry, a battalion of cyclists attached to every cavalry division, and an additional 10 reserve bicycle companies and 17 replacement crews. The Italian Army’s Bersaglieri mountain troops were the first to use folding bikes. During World War II bicycles were introduced to paratroopers as a means to provide them with transportation following the landing. Separate units of bicycle infantry existed in armies of many nations until the end of 20th century, it was not until 2003 that the Swiss Army reformed its last three Bicycle Infantry Regiments.