“Crew of 400”???????????????? Not a chance. Someone has misplaced a decimal point.
You'd be surprised, ships at that time needed a lot of sailors! Most of the battle ships at that time had 3-400 people on board.
You’d be surprised by the crew of those old sailing warships.
Try to imagine how much crew it would take to work all that rigging etc. (A lot). Now multiply that to account for multiple watches. Now consider that each gun had a crew, and there were powder boys to serve them too. Toss in the contingent of Royal Marines, medical, cooking staff, etc and you can see that it really starts to add up.
The USS Constitution, now moored in Boston, was slightly smaller that the Somerset but when it went to sea for a long cruise, say to Hawaii, (three years) it would carry over 500 men. They would lose about one every ten days to accidents, sickness, drowning, etc.
With 64 mounted guns
and a crew of 400, the Somerset brought British power to
the North Atlantic and Mediterranean in the 18th century.