Striker Ross Hannah was sent off for a late challenge as Gainsborough Trinity lost 1-0 at South Shields.
Hannah saw red in the 31st minute and the home side took the lead on half-time when David Foley rounded keeper Jon Stewart to score from a tight angle.
Neil Austin hit the woodwork as Trinity tried to find an equaliser.
Manager Lee Sinnott said: “It was quite a tight game, but I was not happy with the performance even before the sending off.
“They had too much time on the ball.
“What I asked for before the game was not shown.
“I was annoyed on several accounts.”