Hi Richard,
I've cut and pasted a few small details about the Dackel deployment off Normandy. Haven't managed to exactly identify which S-boats fired them on that particular night.
Cheers
Lawrence

The Dackel (TIIId) torpedo had been developed as a coastal defence weapon, improvised from the standard G7e electric torpedo. It was designed to give an exceptionally long range for use against targets such as concentrated invasion shipping where weapon speed was not important. Equipped with the LUT (Lage unabhängiger Torpedo) pattern running apparatus that allowed a torpedo to be fired from any angle and run a desired course, the Dackel was able to cover 57 kilometres (30 miles) at 9 knots while carrying its 620lb warhead into action. The LUT gear installed had been slightly modified to allow a straight run of 34,600 metres before embarking on the first of what could be a maximum of 2,650 long pattern legs. Enlarged to 36 feet by the addition of an empty battery chamber immediately behind the warhead, into which was fitted compressed air bottles that could provide enough air for the operation of depth gear and steerage during over three hours of travel, the weapon could be fired from S-Boat or rafts thus negating the costly and time consuming exercise of constructing launch bunkers.
It was estimated that if Dackel were fired from the entrance to Le Havre they would reach the Allied disembarkation area off the Orne River and their bombardment station off Courseulles, 18 and 24 miles distant respectively. Allowed to run their patterns under cover of darkness, MGK West expected great results despite protestations from Schnellbootführer that with the low profile provided by S-boats, any possible targets at 18 miles distance would be beyond the visible horizon. He also correctly pointed out that original plans to launch at twilight — giving the entire night in which to run —were untenable due to Allied fighter bombers. The S-boats would be forced to depart at night under cover of darkness. He further reckoned that the only possible method of firing was thus by compass bearing, using two waypoints to triangulate and obtain a true bearing of possible targets, transmitting this information to the S-boats by radio. He also feared that inaccurate firing data, faulty running and the effect of strong tidal movement on the slow running torpedoes might wash one ashore thereby revealing the LUT gear to the Allies. He was, however, overruled.


As the K-Verbände prepared for another attack, the delayed Dackel were put into action on the early morning hours of 6th and 7th August, launched by S-boats from the Le Havre approach buoy: six boats (S 174, S 176, S 177 of 2 S-Flotilla S 97, S 132 und S 135 of 6 S-Flotilla) firing between 0136hrs and 0234 on the first night, three boats between 0226 and 0250 on the second.

Dackel were deployed again on the nights of 9/10 August (3 S-boats launching 11 torpedoes), 10/11 August (3 S-boats launching ten torpedoes) and 14/15 August (two S-boats launching eight torpedoes), the cruiser HMS Frobischer, freighter Iddesleigh, Algerine-class minesweeper HMS Vestal as well as minesweeper repair ship HMS Albatros (a 4800 ton ex-seaplane carrier) all damaged. Albatros was hit forward, over 100 casualties suffered in the blast and declared a write-off, though later placed in reserve and recommissioned as a minesweeper hulk