A teenager who had been beaten up, took a samurai sword and went out for revenge, the High Court has heard.
Rocco Burns, 18, from Bryansford Road, Newcastle, threw the sword in the river when police spotted him on 19 January, a crown lawyer said on Tuesday.
Mr Burns claimed that up to five people attacked him but could not give names.
He was charged with possessing an offensive weapon in public and granted bail on sureties of £800.
A curfew and an alcohol ban were imposed.
The court heard that Mr Burns' mother called police to say he had been assaulted and had left home with the samurai sword in a bid to get those responsible.
Police recovered the weapon from the river, while its cover was tucked into Mr Burns' trousers, the crown lawyer said.
Defence counsel said the samurai sword was ornamental and was now with the police.