The introduction should be about 2 sentences long, then comes an about section. That can be much, much longer. But as it stands now, your intro is way too long.
The Royal Navy of Ersetu link is an unapproved subarticle. I would recommend not linking to it.
"...of a bane then a blessing..." Should be than.
You only mention Victualing Board twice and I get no sense what they do, just who they work with.
Needs text between these two lines (New headers require text below them):
Sick and Hurt Board Appointments
Surgeons
"Much fewer and number, they do..." In number, perhaps?
Pretty long and pretty good!