Police officers who attended a house party accidently left a CS gas canister behind after making an arrest.
The house party was held by Joseph Forster at his home in Great Close, South Witham on April 20.
The attending officers were at the house following a report of an assault allegation made against Forster.
Daniel Pietryka, prosecuting, said Forster was aggressive and made threats before assaulting two officers while being restrained.
Mr Pietryka said: “It is kicking to the shin area, swearing and general abusive behaviour.
“Various officers had to grab hold of the defendant. There was a struggle with him and he made threats at the time to head butt the officers.”
Bill Fraser, defending, said the police only attended the party following an allegation made by a disgruntled party-goer who Forster had ejected.
Mr Fraser added: “Mr Forster had to be taken to hospital due to the injuries he suffered while being restrained including bruising to the back of his head and his arms.”
Forster, 35, admitted two charges of assaulting a police officer and one of committing a public order offence at Grantham Hospital.
On his release, Forster made a surprising discovery at home.
Mr Fraser said: “An unfortunate consequence of this was that when he went home he discovered the police had left a CS gas canister in his house.
“He had to make the arrangements to have that collected. He was worried about this because he had young children in the house.”
Forster was fined £70 for each of the three offences. He must also pay £85 costs and a £20 surcharge.