The Matchlock Gun, by Walter D. Edmonds, was published in 1941 by Dodd.
Even Father had never used the matchlock gun. In 1756, New York State was still a British colony, and the French and the Indians were constant threats to Edward and his family. When his father was called away to watch for a raid from the north, only Edward was left to protect Mama and little Trudy. His father had shown him how to use the huge matchlock gun, an old Spanish gun that was twice as long as he was, but would Edward be able to handle it if trouble actually came?