First an appology - I was wrong about the Black Ship - caution ! check carefully before posting. If it is up to the usual standard of Popes writings it will be a good informative read.On the Colours - I suspect that this was composed as "Agitprop", possibly after the event. The "Committee of the Mutiny" would stand for the Committees at Spithead, the Nore and Yarmouth.
The Spithead Mutiny broke out in April (Spring 1797) Billy Pitt (Pitt the Younger) Died in 1806.
Boney was appointed General of the "Army to invade England" in October 1797 and became First Counsul of France in December 1799.
I submit the time frame described in "Colours" would fit the Great Mutinies. And don't forget that the 'Folk Process' can distort anything over time.
Gareth