Appearances, as the saying goes, can be very deceiving.
This happened to be the exact concept behind Q-ships, heavily armed decoy vessels used by Allied navies during the First World War to harass and destroy German submarines, also known as U-boats.
The Germany Navy's U-boat fleet quickly proved to be a scourge in the Atlantic, hunting down and sinking Allied merchant and combat ships with impunity. Able to sneak up to convoys and warships virtually undetected, U-boats began racking up kills in incredible numbers, quickly becoming a threat that needed to be dealt with immediately.
Allied ships, often loaded with troops, supplies, and materiel to aid the war effort in Europe were being lost at astonishing rates. As sonar was still an emerging technology, submarine detection was often difficult if not downright impossible. However, a solution began to form in the minds of Allied naval commanders.
An American Q-ship of the Second World War (Photo from U.S. Navy)
U-boats could only remain submerged for short periods of time, and they were often deployed to sea with a limited supply of torpedoes. As such, most U-boat commanders preferred to run their vessels on the surface, utilizing deck guns for the majority of their attacks on enemy vessels.
The British Navy came up with a solution in the form of a thoroughly disguised merchant vessel carrying a crew of sailors dressed like fishers or merchant mariners. With fake boxes of cargo on the decks of the ship, German U-boats would likely assume that what they see in their periscope's crosshairs was really just a supply ship, transporting munitions and weaponry for Allied soldiers on the front lines.
A juicy and defenseless target, ripe for the taking.
However, these ships were anything but defenseless. Armed with a variety of deck guns in different calibers, and even depth charges in some cases, the crew could open fire after luring the German submarines close enough, sinking, or at least thoroughly disabling, their enemy's watercraft.
One less U-boat in the fight.
The British Admiralty decided that these decoy ships would be homeported at Queenstown, Ireland, where they would have easy access to the North Atlantic, and a safe harbor to return to. They would soon be nicknamed Q-ships, thanks to their port of origin.
Deployed in growing numbers, Q-ships began hunting down and attacking German submarines using deception and surprise to their advantage. As soon as U-boats closed in, panels were dropped, the Royal Navy's ensign was raised and deck guns boomed while sending German sailors scrambling for cover.
HMS Polyanthus, a WWI-era Q-ship with camouflage designed to break up the lines of the ship (Photo from Wikimedia Commons)
However, the plan turned out to be a major dud.
By the war's end, it was found that throughout 150 reported engagements between Q-ships and U-boats, only 14 submarines were destroyed, while the rest were either damaged or had escaped. The Q-ship program had an even lower success rate than mines, which, given the associated numbers and statistics, was highly embarrassing.
The program, once a closely-kept secret, was shuttered and remained fairly dormant in the years between World Wars, though other navies began exploring similar vessels of their own.
Q-ships would make a reappearance during the Second World War, serving with the German, British, American, and Japanese navies. Oddly enough, German Q-ships wound up racking up higher kill numbers than their Allied counterparts.
In the years since, anti-submarine warfare (ASW for short) has advanced considerably, making sub-hunting something of an art form. Thankfully, the Q-ship concept has been relegated to the history books once and for all, having experienced its trial by fire during the two World Wars, and coming up short.