His team were 2-0 down at half-time in Essex and their attempts to climb into the National League South play-off places looked unlikely.
But a thrilling turn around changed all that - Lee Ndlovu stepping off the bench to score twice and inspire a third win in four.
Garrard says he saw it coming and told his downcast players exactly that at half-time.
“I’m not saying I need to do the lottery, but I called it," he said.
“I told them at half-time that we would win this game 3-2. I broke the second half down into spells for them, and thankfully we got the early goal that put the opposition on the back foot.
“We’re a team who like to keep clean sheets and it is frustrating that we haven’t, but full credit to the group.
“I’m don’t think it is going to be a season defining moment, and that’s not me trying to play it down. But it’s a big three point.
“Last week we spoke about what a big week this is. We went to Bath City and won 2-1, and now we go and win a 3-2 at Chelmsford after being 2-0 down.
The manager says his match-winner didn’t hide his frustration at being benched - but then took it out on the shell-shocked Clarets.
He added: “Lee Ndlovu wasn’t too happy about being dropped but I told him maybe he needed a little reaction. He gave us one with two goals."