Overview and historical setting
L-1 class was a wartime naval design associated with the 1914–1918 expansion of fleet capabilities.
L-1 class belongs to the history of submarine warfare. The class was developed for United States Navy during the First World War and the interwar period, and contemporary descriptions identify it as submarine. This setting matters because the design should be read against the missions, technology, and fleet organization available to that navy at the time.
Development and program
The L-1 design formed the larger Electric Boat-derived portion of the U.S. L-class family.
For L-1 class, the documented program can be summarized as 7 planned, 7 ordered, 7 completed, and 0 cancelled. Those figures separate the intended program from the ships that actually reached completion, a distinction that is especially important when requirements changed during a long construction cycle.
The recorded lineage links L-1 class to no explicitly identified predecessor. Lineage is treated as evidence of design relationship, not proof that equipment, protection, or operating doctrine remained unchanged from one class to the next.
Design and operational role
The technical character of L-1 class is described through diesel-electric propulsion and world war i submarine. These characteristics are most useful when connected to the missions assigned to the class, including coastal patrol and anti submarine warfare; they explain what the navy expected the ships to do rather than serving as an isolated list of specifications.
L-1 class should not be treated as one permanently fixed configuration. Individual members could differ during construction and later change through refits, revised weapons, new sensors, altered boats or aircraft, and changes in crew or command facilities. The class page establishes the shared baseline, while dated ship evidence is needed for any claim about a particular hull.
Ships of the class
The documented roster for L-1 class contains 7 ships, and the roster is marked complete. The named members are USS L-1, USS L-2, USS L-3, USS L-4, USS L-9, USS L-10, and USS L-11.
The roster gives L-1 class a measurable production history rather than treating the class as an abstract design. Comparing the member pages can reveal construction differences, refits, transfers, renamings, losses, and preservation outcomes that a class-wide summary cannot assign safely to every ship.
Across the member records, the currently documented outcomes are 7 decommissioned. This summary reflects the available ship records and should be revised when stronger evidence changes an individual vessel’s status.
Service history
Several boats deployed to European waters in 1917–18, where the class was temporarily marked “AL” to distinguish it from British L-class submarines.
Service within L-1 class was not necessarily uniform. Ships built to the same design could enter different theaters, receive different modernizations, or leave service under different conditions. For that reason, an operation documented for one member is not presented as a class-wide experience unless the supporting source makes that connection.
Historical significance and evidence
The class was an important U.S. wartime step toward larger ocean-going submarines.
The significance of L-1 class is best evaluated by comparing its intended roles, the design features selected to meet them, the number of ships actually completed, and the different outcomes recorded across the class. That approach turns the program and roster into evidence about naval priorities rather than treating the class only as a set of measurements.
The evidence used for L-1 class includes Robert Gardiner and Randal Gray, Conway's All the World's Fighting Ships, 1906–1921, Conway Maritime Press, 1985, Wikipedia contributors, United States L-class submarine, Wikipedia, and Naval History and Heritage Command, L-1 (Submarine No. 40), Naval History and Heritage Command. These sources support the chronology and identification presented here; where they do not establish a ship-specific event or configuration, the profile says so rather than borrowing details from another vessel.
Ships in this class
Showing 7 recorded class members.
Sources and further reading
- Conway's All the World's Fighting Ships, 1906–1921Conway Maritime Press
- United States L-class submarine ↗Wikipedia · accessed 2026-09-18
- L-1 (Submarine No. 40) ↗Naval History and Heritage Command · accessed 2026-09-18
- World War I Organizational Chart, October 1918 ↗Naval History and Heritage Command · accessed 2026-09-18