Okay kiddo, so long long time ago in a place called Bulgaria, there was a big fight that happened between two groups of people. It was called the Battle of Aladzha.
One group was called the Byzantine Empire, they were really powerful and had a lot of soldiers. The other group was called the Bulgarian Empire, they were not as powerful but they wanted to protect their land and people.
The Byzantine Empire wanted to take over the Bulgarian Empire's land, so they went to fight them. The two sides fought really hard and it was a very long battle.
The Bulgarian Empire had a clever plan, they dug deep trenches in the ground to protect their soldiers from the enemy's weapons. They also had archers who could shoot arrows at the Byzantine soldiers from a safe distance.
In the end, the Bulgarian Empire won the battle and protected their land from being taken over by the Byzantine Empire. It was a really important moment in their history and they were very proud of their brave soldiers.