Flintlock
Fusil de chasse (French, meaning "hunting gun") - by the mid-18th century a light flintlock musket carried by an officer was called a fusil (corruption of the Italian fucile meaning flint).  Both the French and the British had versions of the officer's fusil.  From this name came the term fusilier. British officers of foot were originally armed with a spontoon, but later the pole weapon was replaced by the officer's fusil. A very similar but cheaper version was the "fusil de traite" (trade gun). The officer's fusil is fitted for a sling and the stock is  shorter than the barrel to fit a bayonet. The officer's fusil was much better made. At 20 gauge (.62 caliber) the fusil was also considered a fowling gun (early predecessor of the shotgun). Some American officers in the Revolutionary War also carried fusils.