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

https://lanenmdp643.iamarrows.com/birth-of-a-banner-when-and-how-the-first-american-flag-emerged

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.