A “fusilier” is a type of soldier, specifically a member of a regiment that is armed with a fusil, which is a type of light firelock or musket. Historically, the term has been used to refer to infantry regiments in the British Army and other military forces. Fusiliers were often associated with light infantry roles and were known for their mobility and effectiveness in combat. The term can also refer to specific regiments that carry the title “fusiliers” as part of their official designation.