Midget Submarines On D-Day #dday70 #dday

Midget Submarine X 23 alongside H.M.S Largs , image from: 

http://assets.dday7.channel4.com/images/timeline1024/4026-x23-alongside-hmslargs.jpg

Midget submarines played a vital part as any other naval craft on D-Day. Their task was to lie up off the Normandy coast on 4th June 1944 during the day, then surface at night. In the early hours of 5th June 1944 2 midget submarines surfaced only to receive a radio signal that the invasion was postponed due to bad weather. They had to dive and lie up for another day. They resurfaced on 6th June 1944 and set up their green signal beacons, which were 18ft high and shone a green light, visible to seaward but not from land.  When the invasion fleet arrived they took the beacons down and erected signal flags. 

Midget Submarine X 23 , image found at ibid.

The use of these submarines were essential so that the troops landing landed in the correct place. During Operation Torch, some landing craft had hit a false beach, landed vehicles and men into the sea who then drowned. It was important, especially with a massive fleet used on D-Day that this was not repeated.

There is some useful info on this on the Royal Submarine Website .