Captain of the fleet
Encyclopedia
In the Royal Navy
Royal Navy
The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

 of the 18th and 19th centuries a Captain of the Fleet could be appointed to assist an admiral
Admiral
Admiral is the rank, or part of the name of the ranks, of the highest naval officers. It is usually considered a full admiral and above vice admiral and below admiral of the fleet . It is usually abbreviated to "Adm" or "ADM"...

 when the admiral had ten or more ships to command.

This was a post rather than a rank in itself, and if its holder's permanent rank was below that of an admiral then he ranked just below the most junior rear-admiral and was entitled to the pay and allowance of a rear-admiral whilst he held the post.

The admiral's commands would be issued through his captain of the fleet, and the fleet's responses would be passed back to him. This role of intermediary between the overall commander and the commanded was analogous to that of a commander
Commander
Commander is a naval rank which is also sometimes used as a military title depending on the individual customs of a given military service. Commander is also used as a rank or title in some organizations outside of the armed forces, particularly in police and law enforcement.-Commander as a naval...

 on a large warship, through whom orders were relayed to the crew and responses received. He would also act in some senses and instances as the admiral's chief of staff.

A captain of the fleet would usually be stationed on the admiral's flagship as its "First Captain", and so that ship would also have a flag captain
Flag captain
In the Royal Navy, a flag captain was the captain of an admiral's flagship. During the 18th and 19th centuries, this ship might also have a "captain of the fleet", who would be ranked between the admiral and the "flag captain" as the ship's "First Captain", with the "flag captain" as the ship's...

or "2nd Captain" for everyday command of the ship itself.
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