The head of the mine was found to be in the summer house, and the tunnel was full of Chitralis.
Harley stationed his men in the summer house to repel any attack and, with five sepoys, jumped down into the mine.

The Chitralis, about thirty in number, came swarming out but, after a fierce fight, they were bayoneted.

The mine was then cleared, and gunpowder placed in position.
Two Chitralis, who had lain quiet at the other end of the tunnel, tried to make their escape in the turmoil.

One of the sepoys fired, and must have hit a bag of gunpowder; for immediately there was a violent explosion, and the mine was blown up, from end to end.
Harley was knocked over, and the Sikhs who were with him had their hair and clothes singed; but none of the party were otherwise hurt.
All this time, the sepoys in the summer house had been subject to a heavy fusillade from a breastwork, close by, and from the loopholed walls in the garden; while from all the distant sangars and hills a continuous fire was opened, the natives evidently believing that the garrison were making a last and desperate sortie.
The work done, Harley and his men hurried back to the fort, having been out of it an hour and ten minutes.

Of the hundred that went out twenty-two were hit, nine mortally.