V2

The V2 is an invention unveiled in the ninth light novel of the series by Dr. Schugel as a manned torpedo that is the cause of the the infamous "Dakar Incident" suffered by the CommonWealth Navy, as well as the springboard for future WTN reporter Andrews investigation into the Eleventh Goddess. They were used by the 203rd Aerial Mage Battalion to take out multiple ships of the Commonwealth Navy, with at least one cruiser and aircraft carrier and flagship Hood being sunk.

Invention

The idea for such a weapon originated during Tanya's days in War College, as part of an exercise directed at coming up with ways for the Empire's continental power to compete with the Commonwealth's navy. Due to her previous life's knowledge of the eventual phasing out of large warships due to air power, she first recommends that the Navy utilize torpedo bombers or submarines to combat ships, unknowing that the torpedos issued to the navy (known as aals or eels), are hopelessly inadequate. Shifting gears, she considers the maiale and kaiten torpedoes employed by the Italian and Japanese navy respectably as a possible solution. With knowledge of various oxygen and movement formulas employed by mages, the concludes that they would be the perfect fit for such a weapon and offers it up for consideration without fully acknowledging the impacts.

 Usage 

The first usage of such weapons was during the Empire's Operation Barbadoi to rescue General Rommel's Southern Expeditionary Corps and shrink the amount of fronts the fight on. Due to Ildoa's declaration of forceful neutrality, Supreme Command decides to instead break through the Commonwealth ships stationed in the region, and utilize maritime passages to free the troops. The 203rd is sent by submarine to the region, and after the wolfpack they are part of spot the ships, begin their attack on the fleet. 6 V2's are aimed at the aircraft carrier, 4 at the cruiser, and the rest target battleships. The Commonwealth navy is caught completely off guard and suffer massive losses in the opening moments of the battle. Unaware that mages are among the enemy, surviving ships immediately prepare for anti-submarine warfare, prepping hedgehogs and depth charges on deck. Just then, the 203rd break cover from the ocean and swiftly target the flammables onboard the ships, capsizing or at least damaging many more. Before they can completely annihilate the enemies, reinforcement Commmonwealth mages arrive and the 203rd is forced into retreat.