Key Points and Summary – The South Dakota-class (South Dakota, Indiana, Massachusetts, Alabama) delivered the mix WWII demanded: nine 16″/45 guns, 16 dual-purpose 5″, dense AA, “balanced armor,” and 28-knot speed.
-Smaller than Iowas but tougher than predecessors, they screened carrier groups, beat back submarines and surface threats, and hammered beaches from the Atlantic to the Central Pacific.
-Skegged shafts, improved maneuverability, and 15,000-nm range made them ideal for fast-moving task forces.
-Postwar, South Dakota and Indiana were scrapped; Massachusetts and Alabama survive as museum ships.
-Verdict: under-rated workhorses whose speed, protection, and firepower safeguarded flattops and shaped U.S. victory across the island-hopping campaign.
The Under-rated South Dakota-class Battleships Were Difference Makers
Without the South Dakota-class of battleships, the U.S. Navy’s efforts during World War Two would not have been as successful. These warships were powerful, fast, and huge – they escorted aircraft carriers and bombarded shores during the Navy’s island-hopping campaign in the Pacific.
The South Dakota-class was made up of four battleships – the USS South Dakota, Indiana, Massachusetts, and Alabama – that were commissioned in 1942.
A testament to U.S. shipbuilding efforts before and after Pearl Harbor, these ships were instrumental in beating back the Japanese during an age when the aircraft carrier had become the center of gravity in naval warfare, but a quicker and capable battleship was still needed to protect the flat-tops.
Heavy in Combat Power
The South Dakota-class battleships displaced around 35,000 tons. They were adorned with nine 16-inch/45 caliber Mark 6 guns in three-gun turrets, and 16 five-inch guns. These could blast the living daylights out of targets on the water and on land.
For better protection from marauding aircraft, the South Dakota-class ships had dozens of anti-aircraft guns of different calibers. When the sailors went to battle stations, they scrambled to the big guns to shoot down enemy planes.
Fast Enough for Escort Duty and Avoiding Submarines
The South Dakota-class ships were smaller than Iowa-class battleships, but they were meant to steam in strike groups and watch out for enemy warships and submarines out to stalk aircraft carriers. The South Dakota-class still had ample armor, and its powerful engines gave it higher speeds than other Navy battleships at the time.
They Were Known for an Impressive Top Speed
The hull-ship ratio was designed for swiftness. These battleships could steam at 28 knots. They were 666 feet long, with a beam of 108 feet. The
South Dakota-class had eight water tube boilers, along with four screws and four steam turbines. The range of the battleships was an impressive 15,000 nautical miles at 15 knots, making them perfect for the large Indo-Pacific region. South Dakota-class battleships also served in the Atlantic theater of operations.
The South Dakotas were escorted by fast-moving destroyers as part of large carrier battle groups to protect from submarine attacks. Design work on the South Dakota-class began in 1937. America was aware of the threat of a rising Japan, and the Navy needed all the ships it could get in the interwar period. Don’t forget the German aggression in Europe. By 1938, Congress ordered a total of four South Dakota-class vessels.
Design Parameters Made for an Excellent Battleship
The South Dakotas had an extra deck on the conning tower and two fewer gun turrets than earlier designs of larger battleships, and the class had 5.9-inch deck armor. One innovative design known at the time as “balanced armor” would protect against enemy shells and torpedoes. There was also an internal armor belt for more survivability.
The battleships were meant to spring out ahead of submarines, but also to remain in line to protect carrier strike groups. These diverse steaming tactics made them even more valuable during the war.
“The South Dakotas had their outboard propulsion shafts in skegs, not inboard. In a general way their shorter hull improved maneuverability while the vibration problems were, if not cured entirely, much reduced compared to the North Carolinas,” according to Naval Encyclopedia.
In 4 Words: Among Best Battleships Ever
The battleships were perfect for supporting amphibious operations in the Pacific. Their massive guns were active during island invasions, and their high speed kept them operative against slower-moving Japanese and German vessels.
After World War Two, the South Dakotas were assigned to the reserve fleet. In 1962 and 1963, the USS South Dakota and USS Indiana were scrapped. The USS Massachusetts and USS Alabama are still museum ships.
The South Dakotas came at the time in history they were needed. Without the South Dakota-class protection, aircraft carriers would have made less of an impact during combat. Plus, these fast battleships had diverse mission sets, with carrier escort, anti-submarine duty, anti-ship combat, and prepping the landing zones for amphibious attacks all part of their portfolio.
The battleships’ design was prepared for these tasks. The 666-foot-long standard was a well-known configuration for the South Dakotas. The immense gunfire they laid down made landings by Marines more successful. The carrier strike groups were much improved in speed and security with the support rendered by the South Dakota-class.
These were historic battleships that have stood the test of time. They served in only one war but will go down as significant difference-makers in battle. They were instrumental in creating a naval force that was second to none after Pearl Harbor, when the battleship fleet was decimated.
A fast and powerful battleship was still needed to win World War Two, and the South Dakota-class did not disappoint the Navy.
About the Author: Brent M. Eastwood
Brent M. Eastwood, PhD is the author of Don’t Turn Your Back On the World: a Conservative Foreign Policy and Humans, Machines, and Data: Future Trends in Warfare plus two other books. Brent was the founder and CEO of a tech firm that predicted world events using artificial intelligence. He served as a legislative fellow for US Senator Tim Scott and advised the senator on defense and foreign policy issues. He has taught at American University, George Washington University, and George Mason University. Brent is a former US Army Infantry officer. He can be followed on X @BMEastwood.
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