J. Duncan Campbell, American Military Insignia, 1800-1851
“ The concept of volunteer Militia units was confirmed in the Uniform Militia Act of 1792, which prescribed flank companies of grenadiers, light infantry, or riflemen for the "common" Militia battalions and a company of artillery and a troop of horse for each division, to be formed of volunteers from the Militia at large and to be uniformed and equipped at the individual volunteer's expense. ”
