There were 36 offensive and defensive systems in total so, we decided that each student was assigned between 3 or 4 of them. Then, each pupil had to do a little rearch in order to know how their systems worked and their purpose. Once done it, they had to able to make a little drawing of the systemas and write also an explanation.
The teacher shared a Google Presentation and there was a slide for each offensive and defensive systems. Students had to complete their slides and explain their systems to the rest of the class so that everybody could understand every single offensive or defensive system used in the Middle Ages.