Police arrested the youth for a number of offences including affray, possession of a bladed article, section 47 assault and resisting arrest.
The 15-year-old was interviewed and later charged with all offences.
He was found guilty on all charges after appearing in court on Monday (March 21).
He was given a custodial sentence of eight months in a young offenders institute.
“We are hoping this sends a message out to anybody who thinks it’s acceptable to act in an anti-social manner,” a spokesman for Lancashire Police said.
“We will continue to bring these people to justice and take them off the streets of Darwen.
“Together we can make a difference to this town and make it safer for all residents and visitors.”
If you witness any anti-social behaviour, contact the police on 999 at the time of the offence.