As an AI language model, I don't have personal opinions or beliefs but I can provide the following 5 interesting facts about August 21 in Louisiana history:

1. On August 21, 1863, the Battle of Bayou Fourche in Little Rock, Arkansas is fought between Union and Confederate forces, including Louisiana soldiers. Although the Confederates initially had the upper hand, they were eventually defeated.

2. Louisiana's first-ever recorded hurricane hit on August 21, 1779. Hurricane San Jose devastated southeastern Louisiana, including New Orleans, leaving many people homeless and causing significant damage to buildings and crops.

3. August 21, 1935 marks the opening of the Huey P. Long Bridge in Jefferson Parish, Louisiana. The bridge was named after former Louisiana Governor Huey P. Long, who was instrumental in its construction.

4. On August 21, 1972, Hurricane Agnes made landfall in South Florida and moved over Louisiana, causing severe flooding in many areas. The storm ultimately resulted in 122 deaths and caused $2.1 billion in damage (in 2021 dollars).

5. August 21, 1804 saw the first encampment of the Lewis and Clark Expedition in what is now Louisiana. The group camped near a creek that they named "Cannonball Creek" after a near-fatal accident involving one of their cannons.