With the week off allowing the other ties to be completed, and the Dons to rest their weary legs and recovered from the cuts and bruises inflicted during the game against Tilbury, the Dons went into the semi-final in good shape. Their opponents, the redoubtable northerners Bishop Auckland, had long been installed as favourites and were playing in their eighteenth semi-final, having won the Cup on seven previous occasions. It was the Dons third semi-final, having been defeated by Bournemouth Gasworks Athletic at Fratton Park in 1929/30 and beaten Enfield in 1934/35 before losing to Bishop Auckland at Stamford Bridge in a replayed final. The other semi-final of the day saw the holders, Bromley, take on Wimbledon’s fellow Isthmian League side Leytonstone. An all Isthmian League final was thought to be the least likely outcome.

Over 3,000 fans made the long journey south from Durham to Dulwich Hamlet’s Champion Hill ground, but they were unsurprisingly dwarfed by the local home support in a total attendance of almost 20,000. A training ground injury to winger Tom Laker had rather dented the Dons fans hopes, his replacement young Dave Walker, who’s only two previous outings for the first team included a game at half-back, where he had often been found playing for the reserves. The Wimbledon News summed up the game as follows;

Never in the history of the Amateur Cup competition can the favourites have been so completely toppled from their pinnacle as were Bishop Auckland in the semi-final at the Dulwich Hamlet ground on Saturday.

Lemmer won the toss and the Dons, playing in red shirts, elected to play with the strong breeze in their favour in the first half. Whether by design or not, it took Wimbledon less than five minutes to take the lead, and that was already at the third attempt. Firstly Walker centred for Edelston, who let the ball over his head for Stannard, but his shot strayed wide in the wind, then Lemmer sent in a long range effort that Washington had to catch on the bounce under the bar. The Bishops went forward, but the ball ran out of play and the goal-kick found Head, he passed to Walker and splendid shot across goal went in off the upright. Four minutes later and Stannard doubled the lead, running to inside-left to receive a pass from Walker and beating Hadfield before coolly placing the ball past Washington and into the net. Wimbledon kept up the pressure and Walker hit the side-netting with a shot and Head forced a save from Washington with a header. Play switched to the other end and Haydock dealt with a shot from Rutherford before turning a header from Teasdale around for a corner. The corner resulted in a scramble in the area from which Edgell reduced the lead in the 32nd minute and, although the Dons pressed again until the break they went into half-time with only a single goal advantage.

It took until the 69th minute for the game to reignite. Clarke took a free-kick in midfield and found Stannard, who flicked the ball cleverly onto Walker, who ran in to score another splendid goal, which received a great ovation from the crowd. The Auckland team hit back within two minutes, Douglas beating Haydock to give them a fighting chance, but Wimbledon remained composed and twice forced Washington to clear his line, firstly conceding a corner from Walker’s shot, then running outside his area to kick a through ball into touch. Ten minutes from the end Stannard finished off the northern visitors when he finished off a smart passing movement with a low shot into the net. Stannard should have completed his hat-trick near the end when put clear by another cross from Walker, but he scuffed his shot yards wide, throwing up his arms in disgust at the outcome, but it didn’t matter, he and Walker, along with the rest of his team-mates had done enough, the final beckoned.