Career
He played at right half or on the right side of the forward line. He was also on the books of Southampton without representing that club in the league. Cassidy scored the winning goal in the 1934 Football League Third Division North Cup Final as Darlington came back from a two-goal deficit to beat Stockport County 4–3 at Old Trafford, Manchester.
According to the Manchester Guardian"s report,
A succession of corner-kicks was gained by Darlington, and from one of these Best headed another equalising goal.
Then, when the referee had his watch in his hand, Cassidy dribbled through the Stockport defence, and he had no sooner shot the ball into the Netto than the whistle sounded for the finish of the match.
