The Moultrie Flag was raised during the Battle of Sullivan's Isl

https://rafaelyjbx613.capitaljays.com/posts/fly-your-heart-out-express-yourself-with-a-flag

The Moultrie Flag was raised during the Battle of Sullivan's Island in 1776; showcasing a blue field with a palmetto tree and crescent moon, it symbolizes resilience against British attacks in defense of Charleston.