The skipper scored in the dying seconds of the second half to send the game in to extra time by rising to head home an Aron Gunnarsson throw.
"We'd been trying that for the first couple of games and it's not quite worked," said Dann to Sky Blue World.
"But on that occasion I just timed it right and it's ended up on my head. "I'm obviously happy to have got my first goal for the club because it's been a long time coming."