Scribner's three-volume set on the US Navy during the ACW. Downloadable pdfs. Very cool.
The Gulf and Inland Waters by Alfred Thayer Mahan
The Atlantic Coast by Daniel Ammen
The Blockade and the Cruisers by James Russell Soley
Some excerpts from The Atlantic Coast:
p.45
Captain Elliott embarked a force of 300 men in scows from a creek one mile below Seabrook, and landed on the site of the earthwork. Signals from him indicated the position of the enemy, and as requested, the vessels opened fire until signal was made to discontinue ...
... the Seneca could not get over until the following morning, when at 10 A.M. she, in common with the other vessels having heavy pivot guns, shelled the enemy at long range, as requested by army signals.
General Stevens wrote to the flag-officer in relation to the co-operation of Commander Rodgers as follows: "Whether regard be had to the beautiful working of the gunboats in the narrow channel of Port Royal, the thorough concert of action established through the signal-officers, or the masterly handling of the guns against the enemy, nothing remained to be desired."
The official report of the enemy gives a total of 8 killed and 24 wounded, the greater number attributed to shells from the gunboats. The result of the action was an abandonment of any future attempt on the part of the enemy to plant batteries near those waters, or to make prepations with the view of landing troops on Port Royal Island.
p.54
While returning, at a narrow stretch known as the Brick-yards, he was fired on with field artillery and small arms. Of this intended attack he had been given warning, and replied with grape, canister, and small arms, with supposed effect.
Nothing more was seen of the enemy until just above the plantation of a Mrs. Campbell, when a large body of cavalry appeared near the river bank, some twelve hundred yards distant. A few XI-inch shells thrown among them caused great haste and confusion. Three miles below, where the river leaves the high land and enters the marshes, the enemy was discovered in ambush, but before he had an opportunity of firing, the Ottawa opened with XI-canister and from three howitzers, it was supposed with great effect ... One master's mate was seriously wounded, and three of the crew less so.
p.59
The operations against Fernandina led to the abandonment of the entire coast line defense by batteries, and to points sufficiently high up on the rivers to embarass an attack by gunboats ...
p.61
The gunboats thereafter patrolled the navigable waters of the St. John's, to the entire subversion of the Confederates getting arms through the small inlets of Florida, to which they had been compelled to resort through a vigorous blockade of all the harbors for vessels of even ten feet draught. The Confederates were not content, however, with having the gunboats in the upper waters of that river, and again endeavored to exclude them, but the effort proved wholly fruitless, and cost them nine more rifled guns, in the earthwork on St. John's Bluff ...
p.72
... At 4.40 P.M. the Isaac Smith got under way and proceeded up the river above Legareville, for the purpose of making a reconnoissance, and being fired upon from concealed and unsuspected heavy field batteries, hotly engaged them. The McDonough proceeded to her relief, but before getting within supporting distance a white flag was seen flying over the Isaac Smith. A nearer approach showed that the vessel was apparently aground and two of her boats were taking the officers and men on shore. Three field batteries then opened on the McDonough, one of six guns, on John's Island; the fire from the enemy was at once returned, the engines reversed, and the vessel dropped down the stream.
Extensive appendices. The kind of detailed history you can't find on Wikipedia.