Those who appeared in the Kaikohe District Court on Friday, and were remanded in custody, were Skip Issachar James Eruera (28, Horeke), Levi Reeves (24, Kaikohe), Grace Tyrone Rangimarie Brack (31, Kaikohe), and Milan Barry Ngamu (40, Kaikohe). The charges against Brack include using a motor vehicle as a weapon.
Four alleged offenders will be dealt with by the Youth Court.
The clash, between members of the Tribesmen and the Bloods gangs, lasted about 12 minutes, ending when courageous Kaikohe residents intervened to separate the groups. The entire incident was captured clearly on CCTV.
Inspector Al Symonds (Whangarei) said the operation sent a strong message to "thugs and bullies" all over Northland.
"Enough is enough. We, and the good people of Kaikohe, won't tolerate this sort of thuggish behaviour," he said.
"If you do this sort of stuff in public, we will identify you, we will hunt you down, and we will hold you accountable. The people of Kaikohe deserve a lot better than this."
Seventeen Tribesmen and a smaller number of Bloods had been involved, he added, and given the weapons used there had been "real potential for someone to end up dead."
The children of some of those arrested had been placed with responsible family members or in CYF care.
"We never like to separate families, but we just can't tolerate this sort of behaviour in a public place with these weapons involved," Inspector Symonds said.
It was the biggest police operation in the Mid-North so far this year, but it wouldn't be the last.
"We'll come back if we need to," he said.
Meanwhile anyone with information about gangs, drug dealing or other crime was urged to call the police or the anonymous Crimestoppers line, 0800 555-111, Inspector Symonds saying the best way to combat organised crime was to cut off offenders' income from drugs and violence.