American Regiment

From this site

1740

Philadephia, Pennsylvania — Eight hundred volunteers drawn from the militia of several colonies board transports to sail as part of the joint British/American colonial expedition to capture the Spanish colony of Cartagena (today the nation of Colombia). In all, troops from eleven colonies take part in this endeavor, which ends in failure, due more to disease than enemy actions.
Caption
An officer (2nd from right) and men of the American Regiment organized to capture the Spanish colony of Cartagena. Except for the more practical light weight linen of the campaign dress shown on the right, the issued uniform was based upon the pattern worn by the British Army of the period.
Painting by Charles McBarron, Company of Military Historians