[jp10]

Some countries fielded folding bicycles that could be backpacked across difficult terrain. Some mainly used them for scouting or communication duty while some had a bicycle unit attached to Light Infantry formations to move ahead and seize a position and wait for the other companies to arrive. Once in a defense they could be pulled back as a mobile reserve.
In an attack situation, Belgian and Italian doctrine roughly had one man per 9-10 bicycles stay with the cycles so it was about a 90% effective attack force when dismounted.