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

https://simonbeti328.theburnward.com/what-was-the-first-american-flag-called-the-origins-of-the-stars-and-stripes

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.