"The Muggle army of England held its position for nine days. They lacked supplies and could only eat a few wild berries to keep themselves alive, and despair naturally began to spread..."
"And so Dementors were born. But the Muggles couldn't see those Dementors, especially the Muggle army of England. They were already cold and hungry because of the heavy rain..."
"Dementors longed for intense emotions, so they left the English Muggle positions and sought out the French Muggle army, whose morale was higher, drawing happiness from them..."
"On October 25, 1415, Dementors hovered over the French Muggle army, affecting its combat strength. They couldn't even charge, and the heavy infantry were staggering as they walked..."
"The French Muggle army had already lost many men. Several thousand Muggles lay dead across the wilderness... A wizard happened to pass through Agincourt. His name was Gifford Ollerton..."
"He had just completed a Giant hunt. When he passed through Agincourt, he had originally intended to avoid the Muggles caught up in the war, but he noticed the Dementors flying in midair."
"Gifford Ollerton was a brave and upright wizard. He had made it his life's ambition to hunt cruel Giants, so when faced with those Dementors lost in revelry, he chose to cast the Patronus Charm..."
"That is what you wanted to know... For wizards, the Battle of Agincourt was very simple. It was just a wizard passing through Agincourt who drove away the Dementors occupying that place."
Professor Binns looked at the group of "Education Investigators." "Is there anything else you want to ask? If not, please give up your seats. I still have two classes to teach this morning."
Malcolm Sharma pressed his lips together, subconsciously shook his head, then sighed unwillingly.
He looked up at Professor Binns. "In other words...