There are no accurate historical accounts of Medieval school shootings. The very first account of a school shooting happened in the United States on July 26, 1764. This took place a few years after the start of the Industrial Revolution and during the Pontiac War. The event is known today as the Enroch Brown school massacre.

Enoch Brown: A Massacre Unmatched By Megan D. Strait, Fall 2010.

"On the morning of July 26, 1764, a group of Indians made their way into the Cumberland Valley. Three miles north of what is today called Greencastle stood a small schoolhouse where Christian schoolmaster Enoch Brown and eleven of his pupils were preparing to start the day. Shortly after they began, three warriors rushed into the schoolhouse, capturing Enoch Brown and the eleven students. Two Indians guarded the door while the other clubbed the schoolmaster and ten students before scalping and leaving them all dead. One student, Archie McCullough was scalped but the Indians did not realize he had not been killed. He hid in the fireplace inside the schoolhouse for some time before making his way to the nearest spring. There he washed his head before a nearby neighbor to the school found him."

It's not clear whether Mr Enoch was shot or scalped, but some sources indicate that he was shot. It is known that the rest of the students were scalped with a Tomohawk

The first school shooting was in 1764: By Bill hand, April 2018.

"Enoch was the first to die. According to most accounts he was shot; then each of the children were bludgeoned and scalped."

Edit: Additional Notation.