"defend against a sortie by the Confederate ironclads" Again here I think "Confederate" deserves a link.
"Description and construction" doesn't have a link to a class article. Just wanted to see if this was intentional.
I rarely put a main|class link, preferring to do that in the lede and the infobox.
" spotted a line of breastworks that the enemy was building at Howlett's Farm" -- "enemy" should be avoided as I'm sure you know.
It's what happens when I read too many primary sources.
"Service" alternates between including and not including the "USS" prefix in ships mentioned.
" Despite the bursting of one of her guns on 13 January, and the wounding of one crewman, the ship fired 212 shells during the battle." -- As phrased this implies the wounding of one crewman was a major hurdle to overcome. I assume you prefer to say "Despite the busting of one of her guns on 13 January, which wounded one crewman, the shop..."
Your phrasing is better.
"the monitor steamed to Cuba to investigate reports of mistreatment of Americans during a revolt there. " -- I've occasionally seen people pushing to not use "Americans" in articles in this context (technically Cubans are "Americans" by virtue of being from the Americas.
Five duplicate links are showing up in the checker.
One external link (the Cornell link) appears to be broken.
No disambiguation links detected. I see no problems with article neutrality or stability. The images appear to be properly licensed.
Placing the article on hold pending improvements. —Ed!(talk) 02:43, 26 March 2013 (UTC)