Early 20th Century Naval Revolution: Aircraft Carriers and Submarines

Two technologies transformed naval warfare from surface-only engagements to three-dimensional ocean control: aircraft carriers and submarines. Both matured in the early 20th century and defined naval strategy through World War II and beyond.

Aircraft Carriers: Projecting Power Over the Horizon

Evolution

• 1910: Eugene Ely flies off USS Birmingham (cruiser platform)
• 1918: HMS Argus — first flush-deck carrier
• 1920s-30s: Lexington, Saratoga, Akagi, Kaga, Ranger, Yorktown classes
• 1941-45: Carrier vs. carrier battles (Coral Sea, Midway, Philippine Sea) prove dominance

Strategic Impact

• Extended naval reach from gun range (20 mi) to air range (300+ mi, later 1,000+ mi)
• Made battleships secondary — Pearl Harbor, Taranto, Midway demonstrated
• Enabled power projection without local bases
• Created carrier strike group — still core of US Navy power

Submarines: Stealth Under the Surface

Evolution

• WWI: U-boats prove commerce raiding potential (unrestricted submarine warfare)
• Interwar: Fleet submarines (US Gato/Balao, Japanese I-boats, German Type VII/IX)
• WWII: US submarines destroy 55% of Japanese merchant shipping, 30% of warships
• 1954: USS Nautilus — nuclear propulsion = true submersible (unlimited submerged endurance)

Strategic Impact

• Invisible threat — forces convoying, ASW investment, route changes
• Strategic deterrence: SSBNs (ballistic missile subs) = nuclear triad leg
• Intelligence/special operations platform
• Area denial: cheap submarines threaten expensive surface ships

Combined Effect: Three-Dimensional Naval Warfare

Pre-1900: Surface only (2D).
Post-1945: Air (carriers) + Surface + Subsurface (submarines) = 3D battlespace.

Modern Continuity

Today's supercarriers (Ford class) and nuclear attack/ballistic submarines (Virginia, Columbia classes) are direct descendants. The carrier-submarine dyad remains the centerpiece of great power naval competition. Hypersonics, UUVs, and directed energy add layers—but the 1900s breakthrough created the framework.

Two inventions. Three dimensions. One transformed ocean.