What was A merchant vessel outfitted to fight?

A merchant vessel outfitted to fight is commonly referred to as a "privateer." These ships were typically merchant ships that were armed and authorized by a government to engage in warfare, particularly against enemy vessels. Privateers operated during times of conflict, capturing enemy ships and cargo, and were often motivated by profit, as they could keep the spoils of their captures. This practice was a legal form of piracy sanctioned by letters of marque issued by governments.