Danzig was also difficult to attack, only being accessible from the west, while all other directions were covered either by the Vistula to the north or wetlands to the south and east.

[2] Inside Danzig stood 14,400 men under the Prussian commander General Count Friedrich Adolf von Kalkreuth.

Russian forces made an attempt between 10–15 May to bring 7,000[7] reinforcements to the city, led by General Kamensky, ferried in 57 transports under the escort of the British sloop of war Falcon and a Swedish ship of the line.

This allowed Lefebvre time to reinforce his positions, and the outnumbered Russian troops were beaten back with a loss of 1,500 men killed and wounded.

Seeing that he could no longer hold out, Kalkreuth sued Lefebvre for peace, requesting the same capitulation terms given by the Prussians to the French in Mainz in 1793.

The terms were generous because Napoleon was eager to put an end to the siege since the summer (and the fighting season) was approaching and he needed to remove the threat to his rear and to reposition the troops elsewhere.

Napoleon then ordered the siege of the nearby Weichselmünde fort, but Kamensky had fled with his troops, and the garrison capitulated shortly afterwards.