During the war there was a training devise for bayonet training. It was a stick about 7" long and maybe 2" in diameter. One end was padded the other had a ring on it about 21/2" to 3" in diameter. The instructor would gather the trainees in a circle around him facing toward him. The instructor standing in the centre could then face any of the men and challenge them with an "On Guard" and the trainee would immediately come to the On Guard position and the instuctor would lunge at him with the stick. If the trainee successfully parried the lunge the instructor would position the ring end of the stick for the trainee to put his bayonet through it. If the trainee was not successfull in parrie he would get the padded end of the stick in his chest or worse.
I used to have one of these sticks it should be down in our museum. I'll bet that the majority of people haven't a clue what it was used for.