Darlington recorded a third straight league win at the expense of Tamworth.
The game started brightly with Adam Rundle hitting the bar for the hosts and Iyseden Christie seeing a shot cleared off the line for the Lambs.
Rundle put the Quakers in front after the break when he latched on to Dale Hopson's through-ball to slot home.
The visitors had chances to equalise but were made to pay for their wastefulness when Hopson wrapped up the win with a cool finish in injury-time.
VIEWS FROM THE GROUND
Darlington boss Craig Liddle spoke to BBC Tees about the performance of keeper Sam Russell:
"I think he made three or four good saves, a couple of scrambles and that's what he's there for.
"When I took over as caretaker manager he was one of the first players I installed in the team.
"I don't think there are many better at this level than him, you need to build teams around certain players and hopefully Sam will be big part of this club moving on."