Initial ocean going ironclad cruisers, such as the French Gloire and the British HMS Warrior were only just emerging in 1859 and 1860, and were beyond the budget and timeline necessary for rapid force deployment that the CS Navy needed for immediate coastal defenses in 1861.
Therefore, the Confederate Congress voted $2 million in May 1861 to buy ironclads from overseas, and in July and August started work on construction and converting wooden ships locally.
In the failed attack on Charleston on April 7, 1863, two small ironclads, Palmetto State and Chicora participated in the successful defense of the harbor.
But the CS Navy attempts to procure ironclad cruisers from overseas were frustrated as European nations confiscated ships being built for the Confederacy.
Used for river defense, CS Army cottonclads were typically more lightly armored and reinforced than a regular ironclad, such as the General Sterling Price, which was converted by placing a 4-inch oak sheath with a 1-inch iron covering on her bow, and by installing double pine bulkheads filled with compressed cotton bales.