A 1939 escort mission illustrates why the compact, fast battleships could have become France's far-ranging presence ships after the Richelieus entered service.
The closing prompt asks how two 36,000-ton, twelve-gun French capital ships might have changed German and Italian planning - and whether anyone would call them battlecruisers.
A closing scenario moves both ships to Gibraltar at France's fall and asks how Allied strategy changes if they are neutralized like the Alexandria squadron or join the Free French.
The opposing cruiser-destroyer forces included future American institutional leaders and Japanese officers whose later histories require careful treatment.
Rabaul's wider sea approaches offered convoys more ways around submarines than Singapore's restricted approaches, helping explain the base's importance to Japan.
The 1 November landing threatened Japan's position around Rabaul and prompted an attempt to reinforce Bougainville and disrupt the amphibious operation.
The Allied command arrangement linked Pacific, South Pacific, naval, army, air, and amphibious leaders around the practical problem of keeping a beachhead supplied.
Merrill's force paired rapid-firing, radar-directed Cleveland-class cruisers with eight Fletcher destroyers arranged to protect the cruiser core from torpedo attack.
Japan's two heavy cruisers, two light cruisers, and six destroyers had heavy guns and torpedoes, but a more complicated formation than the American destroyer squadron.
Although Omori was later relieved for withdrawing, radar-equipped American cruisers and destroyers made his opponent more formidable than a simple ship count suggests.
After being relieved over Empress Augusta Bay, Omori returned to torpedo training and eventually directed the division responsible for Kaiten human-guided torpedoes.
The troop transports left before Japan's surface force arrived, though cargo unloading continued, and an air attack on Haguro restricted the approaching formation's speed.
Disabled steering, collisions, and Foote's torpedo damage added navigation hazards to a battle already confused by unreliable weapons and mistaken hit reports.
Spence's reduced speed and uncertain identity complicated the pursuit before Hatsukaze was sunk and dwindling fuel and ammunition forced the Americans to regroup.
Osugi's destroyers pressed ahead without tracking the heavy-cruiser flagship's maneuver, helping produce a collision and forcing the Japanese torpedo attack to be abandoned.
Radar, stealth, and earlier attempts at concealment change who sees first, while officers must adapt habits formed under different identification systems.
The LCS programme reflected a Post-Cold War belief that peer naval battle was unlikely and that American sea power would concentrate on influencing events ashore.
A medieval aside uses Saladin's attention to water supply to show how armies fail when they carry familiar environmental assumptions into an unfamiliar campaign.
Submarines have demanding engineering requirements, but their focused role can make future requirements clearer than those of multi-purpose surface ships.
A replacement decision turns on whether new systems can be fitted without exhausting the hull's useful life or consuming disproportionate dockyard effort.
A smaller successor class can look efficient on paper while leaving too few ships to cover refits, breakdowns, training, and the fleet's standing missions.
Delaying purchases can preserve newer airframes for later, yet halting continuous production leaves ageing fleets in service and complicates planned retirement dates.
A navy that appears free of procurement trouble may simply operate within a system that hides problems, while heavy spending on old hulls can reveal difficulty with their successors.
A class can be planned under one government's strategic priorities and operated under another's, leaving its design and expected missions out of alignment.
A crisis can make dictatorship look decisive and effective, but suppressing criticism also removes the feedback that exposes weak decisions and inflated claims.