The obstructions sunk in the Delaware had in some degree changed its channel, in consequence of which the Augusta and the Merlin grounded, a considerable distance below the second line of chevaux-de-frise and a strong wind from the north so checked the rising of the tide, that these vessels could not be floated by the flood.

Their situation, however, was not discerned that evening, as the frigates which were able to approach the fort, and the batteries from the Pennsylvania shore, kept up an incessant fire on the garrison, till night put an end to the cannonade.

Early next morning it was recommenced, in the hope that, under its cover, the Augusta and the Merlin might be got off.

The Americans, on discovering their situation, sent four fire ships against them, but without effect.
Meanwhile, a warm cannonade took place on both sides, in the course of which the Augusta took fire, and it was found impracticable to extinguish the flames.

Most of the men were taken out, the frigates withdrawn, and the Merlin set on fire; after which the Augusta blew up, and a few of the crew were lost in her.
This repulse inspired congress with flattering hopes for the permanent defence of the posts on the Delaware.