The court was told that the four teenagers, who cannot be named for legal reasons, had given themselves up to police after confiding in their teachers following an appeal for witnesses.
A 17-year-old from the Cheetham Hill area of Manchester pleaded guilty to common assault and was sentenced to a four-month detention and training order.
Two others, a 16-year-old from Cheetham Hill and 17-year-old from Fallowfield, admitted grievous bodily harm with intent and got six-month orders.
The fourth, also 17 and from Fallowfield, pleaded guilty to grievous bodily harm with intent and assault by beating in relation to a passer-by who was also punched. He was sentenced to a six-month order.
slaps on the wrist, probably get counseling for the slaps too