Pirates favour a type of ship called a sloop.
Draft lets it enter inlets and bays where the water is not deep enough for a large ship to follow.
If pirates fly a black flag, it means they will show mercy to those who give up their goods and ships.
If they fly a red one , it signifies that they shall neither give nor take quarter . The fight is to death.
“ I shall wither give nor take quarter! “
( Edward Jack also known as Blackbeard)