A second successive home win and another sheet for birthday boy keeper Kyle Moore has lifted Truro up to fifth in the Southern League premier division table and right in the battle for a place in the end of season play-offs
Veteran Barry Hayles was the City matchwinner just before half time, when he headed home from close range for his fourth goal of the season.
It was another important three points for City, who travel to eight-placed Hungerford Town on Tuesday evening.
They wanted to build on the 2-0 midweek win over Paulton Rovers and manager Steve Tully made just change, bringing in Arran Pugh after suspension with Dan Green dropping to the bench.
It meant Tully continued at the heart of a three-man defence flanked by Pugh and Rob Farkins.
And the new defensive formation again worked as City withstood some strong late Cambridge pressure to claim three crucial points.
There was little goalmouth action in the first half with Ryan Brett coming closest for Truro with a low drive which fizzed just wide.
And the breakthrough came in the minute of the half, when Cambridge failed to clear a free-kick and the ball fell kindly to Hayles with the veteran calmly headed into the empty net.
Boosted by the goal, Truro started the second half strongly, but found Cambridge keeper Harry Reynolds in great form as he produced fine stops to deny first Shane White and then Dan Green who had replaced Les Afful at half time.
City though could not find a second goal and as the half wore on Cambridge started to apply some pressure with sub Andy Phillips just unable to get his head to a cross and then heading wide from a cross by Oliver Emsden.
Truro though defended resolutely in depth and with some sound handling by Moore, who was celebrating his 19th birthday, ensured the victory, leaving Cambridge without a win in nine .
CITY: Moore; Farkins, Tully, Pugh; Afful (Green h-t), Lowry (Cooke 66), White, Ash (capt), Brett, Hayles (Vassell 57), Wright. Subs (not used): James, Searle.
Yellow cards: Hayles (39)..
CAMBRIDGE CITY: Reynolds; Lewis, Day (Phillips 58), Vilcu, Chaffey (capt), Harradine (Phillips 68), King, Juliusson, Kelly, Bacon, Dawkin, Sub (not used): Midgley.
Yellow cards: Vilcu (41), Bacon (45) Julisson (45+3).
Goal: Hayles (44) 1-0.
Referee: Adam Penwell.
Read more: http://www.westbriton.co.uk/Hayles-heads-Truro-City-fifth-table/story-23510246-detail/story.html#ixzz3HMv8nptJ