Check the listing for details. Pattern 1861 US Army "McDowell" Forage Cap Size Small (6-3/4 to 6-7/8). Condition: New. Listed at 29.00 USD. The Pattern 1861 US Army Cap, otherwise known as the "McDowell Cap" or "Forage Cap" was a popular style borrowed from the French and Austrians. Contractors for the US Army produced hundreds of thousands during the Civil War.