Prior flicked in a near post header from a corner five minutes from time to give the visitors a 4-3 win in Essex.
It was Hawks’ fifth successive league win and their sixth in an unbeaten seven-match start.
They trail leaders Ebbsfleet United - who have won all seven of their games so far - by two points.
And so the scene is set for a mouthwatering tussle when Ebbsfleet visit Westleigh Park next Saturday!
2. Hawks fans shake hands with Chelmsford keeper Jacob Marsden
Picture by Dave Haines Photo: -
3. Goalkeeper Charlie Searle celebrates after the final whistle
Picture by Dave Haines Photo: -
4. Jake McCarthy celebrates after scoring Hawks' third goal
Picture by Dave Haines Photo: -
1 / 3