It looked like Harriers may be frustrated in front of goal until Ducros gave them the lead on 53 minutes.
A fine Williams through-ball put the striker in space on the right and he cut inside his marker before planting a firm shot in off the far post. Danny Williams
Shell-shocked Darlington quickly made a double substitution five minutes later with attackers Wainwright and Sheeran on for Hodgson and Clark.
Harriers kept up the pressure after the goal and Brightwell was booked on the hour for bringing down the rampaging Henriksen close to the penalty area.
Shilton drove the angled free-kick in low but straight at the keeper who handled comfortably.
Ducros was having more of an influence now and he released Foster a minute later only for the speedy front man to fire wide at the far post.
Harriers introduced Smith for his first game since November on 62 minutes, replacing Shilton in midfield.
On 66 minutes Harriers midfielder Bennett was booked for encroaching at a free-kick.
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