Theory: What happend on the fire nations darkest day?

In the series “The Last AirBender '' Sokka finds a burnt scroll with a mysterious bad day of the fire nation. We are never told what happened that day but we learned that their magic is nullified during an eclipse. This post will serve as a theory of what happened. In the series “The Last AirBender” There was an episode where the cast went to an underground library. Sokka finds a semi burnt scroll that says “The Darkest Day In Fire Nation History” he even states that there is a date at the top but for the users who can't read traditional chinese they would never know the date. If you look up the translation the date reads July 9th of the dragon year(Happy new year if this goes up on new years). So we know that the fire army is very barbaric. They love war. We also know that their power gets stronger during the day and during hot days. So logistically in July that would be the hottest part of the year. I think it's very possible that there was a massive siege they executed and were foiled due to the eclipse. I think the enemy they attacked dealt a lot of damage and casualties because the people of this series seem to rely heavily on their magic so naturally they would not be able to fight without their abilities. I hope you enjoyed the post and happy Chinese new year if you celebrate it.