Firefighters were met with a hail of missiles and abuse hurled by teenage louts after being called to Cedar Grove, where a bonfire had been lit.
Among the objects thrown at them were lit fireworks and glass bottles. Despite the violence, none of the officers were hurt.
As a result of the attack in Alnwick, crews will now be accompanied by a police escort whenever they are called to Cedar Grove.
A spokeswoman for Northumbria Fire and Rescue Service said: "Our firefighters are trying to save lives, yet there is a minority of people who threaten and abuse them and we will not tolerate this."
Alnwick Neighbourhood Sergeant Dave Garrick said: "We did receive one report of youths throwing fireworks towards firefighters in Cedar Grove around 10.15pm.
"However on arrival no-one was there. Anyone with information should contact police in Alnwick on 03456 043043 ext 61326."
The sickening scenes marred what had been a largely successful pre-Bonfire Night campaign by the service, which saw call-outs to incidents drop by 42 per cent.
A total of 134 calls were received on November 5 across the region, while incidents that required firefighting action also fell from 72 in 2007 to 32 last night.
Anyone who wanted to hold a bonfire was invited to register their contact details with the Fire and Rescue Service before October 24 so that experienced fire service personnel could carry out a thorough risk assessment on the proposed site.
They also offered advice on how to keep the bonfire under control and provided the organisers with 'Safe Bonfire' approval.
Dave Myers, the man in charge of Northumberland Fire and Rescue Service's Arson Task Force, believes the new scheme has been a real success.
"By getting people to register their proposed bonfire before November 5 we were able to go out and use our expertise to ensure that these bonfires are going to be held safely and monitored responsibly on the night.
"We assessed 29 locations across Northumberland to inspect proposed bonfire sites and I believe that this approach has helped to reduce both the number of calls and incidents that required firefighting action on the night itself."