A relation bought the paintball session for Bret Ravenhill, 32, to "cheer him up" after his father died but he lost his temper at the end of the day, Sheffield Crown Court was told.
Stephanie Hollis, prosecuting, said Ravenhill was in an opposing team to the youngsters at a centre near Doncaster, South Yorkshire.
There were no problems until the last game of the day when Jordan Jackson, 14, was eliminated and was making his way to the "dead zone". Ravenhill was then shot at close range and reacted in an "extremely angry fashion".
He struck out at the teenager with his paintball gun — knocking him down with a blow to the leg — and then confronted Ian Duffy, 25, a marshal who asked him to calm down.
Ravenhill punched him and as the marshal radioed for help, the defendant armed himself with a stick and confronted Mr Duffy saying: "Don't do anything stupid or I will stab this in your neck."
Ravenhill walked off but came across Matthew Griffiths, 16, and punched him in the face.
He told police he had suffered a number of close range shots at the end of the day and was very angry. He said he was suffering emotionally after losing his father to leukaemia six days previously.
Ravenhill lost his lower left leg in a motorbike accident in 2002 and made headlines in February 2009 when an electronic tag was fitted to his detachable false left leg by a security company.
Ravenhill, of Great Houghton, near Barnsley, admitted three offences of assault by beating. He also admitted criminal damage after smashing up a woman's car when she ended their relationship, and breach of a suspended jail term.
He was given six months for the assaults, two months concurrent for the criminal damage and six months of the suspended sentence was activated consecutively, giving a total of 12 months in prison.
Idiot attacks children while playing paintball...
This post has been edited by spqr-king: 21 February 2013 - 11:13 PM