The volunteers explained to the students several first aid techniques: how to dress a wound; how to immobilize a broken limb; how to perform CPR and more.
In the end we hope that no child gets into a situation, where these skills will be needed. However, it is better to be prepared for something, than not to be if the need for that skill arises.
We should also remember, that when providing first aid to another person, we are doing it only until qualified medical personnel arrives at the place!