Ruse de guerre

The opening explains why concealment is difficult at sea and why wartime uncertainty changes anti-submarine tactics.

A feigned withdrawal draws the larger Persian fleet into waters where it cannot exploit its numerical advantage.

Sun Tzu and a light-cavalry analogy frame deception as supplying an opponent with a convincing but curated picture.

A Royal Navy warship poses as a fleeing merchantman to separate a pirate vessel before returning to defeat Roberts.

Nathaniel Dance turns valuable East Indiamen into the appearance of a disciplined Royal Navy squadron and drives off a French force.

The merchant disguise in Master and Commander reflects a long naval practice rather than a World War I invention.

Removing heavy weapons created troop capacity, while wooden 12-inch substitutes preserved the threatening appearance of a pre-dreadnought.

A troop-carrying sailing ship could shift its reduced battery to the visible side and conceal that the opposite broadside was empty.

Captured signals and an altered silhouette delay St Nazaire's defenders by making the approaching destroyer difficult to classify.

The delayed explosion briefly left a theoretical chance to save the dock, though any repaired facility could later face RAF attack.

Purpose-built Deutschland-class raiders struggled to conceal a distinctive and arguably ill-matched warship design, while merchant conversions hid weapons naturally.

Aircraft, trawlers, and merchantmen can report a raider without being detected, so each disguise must expire after a possible sighting.

A Town-class cruiser nearly exhausts its fuel escorting a liner designed to sustain speeds that warships normally use only in bursts.

The fast minelayer already carried formidable twin 4-inch guns, while an early non-deck-piercing 4.5-inch mount might have made her still more dangerous.

A fast minelayer manipulates movement and transmissions so Italian listeners infer that two British battleships are at sea.

D-Day planning and the Gulf War show how a credible fleet offshore can divert defenders even when no assault follows.

Motor launches, chaff, fictional armies, and officer doubles make Norway and Calais appear to be live invasion threats.

Merchant hulls dressed as capital ships and a disguised gunnery-training vessel supply the British strength that German planners expect to see.

A believable older battleship decoy threatens losses Germany cannot afford even if its raider could win the immediate fight.

Stealth and electronic warfare can conceal the real force while giving the enemy a credible false contact to pursue.

A speculative naval analogy asks how sensors will distinguish merchant spacecraft from warships when their visible signatures can be made alike.

Merchant-based Flower-class sloops combine convoy, anti-submarine, and deception roles before influencing World War II corvettes.

Repeated naval-base port calls and former Royal Navy crews suggest that some sold sloops may have retained observation value in civilian service.