 Following the war, Sir Charles went to Saint Petersburg to help re-organize the Russian navy for Catherine the Great in 1764–1765.He was elected a Fellow of the Royal Society in May, 1770 for carrying out "a series of curious experiments to determine the different degrees of cold at different depths in the Sea".After the American War of Independence broke out in America in 1775, Douglas was given command of a squadron to relieve Quebec from the siege.