A variety of flags had been designed for naval battles throughout the time of the Civil War; those blanketed distinguishing marks for ships

https://kylerstiu890.oakridgedigest.com/posts/civil-war-flags-in-reenactments-authenticity-and-representation-3

A sort of flags were designed for naval battles all through the Civil War; those covered distinguishing marks for ships engaged in battle on rivers and seas alike.