Charlie Hester-Cook gave the Hornets an early lead as they looked to recover from Saturday’s loss at Hastings, but Chi City stayed in the game and levelled midway through the second half through Jimmy Wild.
But new boy Chris Dickson was the hosts’ hero when he popped up for an 87th minute winner.
See pictures by John Lines on this page and the ones linked. Or if you’re on the Observer app, just scroll down the page.
Get the local football action in the West Sussex County Times and the Chichester Observer, out on Thursday.