Peace of Basel
Don was not evacuated with the rest of the British army in 1795 after the campaign's collapse, but instead remained in Europe in the service of the Prussian King. Prussia had been knocked out of the war following the Peace of Basel in 1795, but remained allied to Britain in her struggle with France and Don was seconded to the Prussian court as a liaison officer. He may have coordinated espionage activities against France during this period, although records are vague.