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Decima Flottiglia MAS

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The Decima Flottiglia MAS (Decima Flottiglia Mezzi d'Assalto, also known as La Decima or Xª MAS) (Italian for "10th Assault Vehicle Flotilla") was an Italian commando frogman unit created during the Fascist government.

The acronym MAS had arisen previously in Italian naval history: during the First World War Italy had torpedo boats named "MAS" followed by a number, where "MAS" was Motorbarca Armata SVAN (Armed Motorboat SVAN) and SVAN stood for Società Veneziana Automobili Navali (Naval Automobiles Society of Venice). Ref. [link].

In 1943, when Italy, after ousting Benito Mussolini, switched alliances to the Allies, those Xª MAS men who were in the German-occupied north of Italy defected to the Italian Social Republic (the puppet state set up by Nazi Germany in northern Italy) and became an anti-partisan force operating on land. In this setting, no longer connected to marine activities, the Xª MAS committed a large number of war crimes, and is now remembered as one of the most ruthless military corp of the war, akin to the German SS.

See Italian commando frogmen for the COMSUBIN frogman corp currently serving for the Italian Republic, and for their postwar actions.

Historical Background

In World War I, on November 1, 1918, Raffaele Paolucci and Raffaele Rossetti rode a torpedo-like craft (nicknamed Mignatta, which means, "leech") into Pula's harbour, where they sank the Austrian battleship SMS Viribus Unitis and the freighter Wien using limpet mines. They had no breathing sets, and had to keep their heads above water to breathe, and thus they were discovered and taken prisoners.

In the twenties, sport spearfishing without breathing apparatus developed on the Mediterranean coast of France and Italy. This spurred the development of modern swimfins, diving masks and snorkels.

In the thirties, an unknown Italian swam underwater with an industrial or submarine-escape oxygen rebreather, probably to make his sport of spearfishing easier. Other Italian sport spearfishers imitated, and that was the start of scuba diving in Italy.

Origins

Badge of the Xª MAS
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Badge of the Xª MAS

In 1938 the 1ª Flottiglia Mezzi d'Assalto ("First Flotilla of Assault Vehicles") was formed as a result of the research and development efforts of two men, Major Teseo Tesei and Major Elios Toschi of the Regia Marina. The two resurrected Paolucci and Rossetti's idea.

In 1940, Commander Moccagatta of the Regia Marina (Italian Royal Navy) reorganised the First Flotilla into the Decima Flottiglia MAS, under the command of Ernesto Forza. It secretly made manned torpedoes or SLC (siluri a lenta corsa or "slow-running torpedos") and trained military frogmen (called nuotatori, Italian for "swimmers"). In the process, he created the scuba-diving school at the small San Leopoldo port of the Italian Naval Academy in Livorno.

All personnel in Italy's Armed Forces of the time that were to operate oxygen rebreathers and similar equipment were dispatched to the school, but only a selected few were chosen as operators of the newly-designed manned torpedoes. The nascent Xª MAS contained two units, one specialised in operations where the frogman swam to their attack site, one in the use of manned torpedoes. Teseo Tesei developed a number of specialist vehicles for them.

Engagements as an Italian Corp

The Decima Flottiglia MAS saw action from June 10, 1940 when Fascist Italy joined in World War II. In more than three years of war, the Decima Flottiglia MAS destroyed some 72,190 tons of Allied warships and 130,572 tons of Allied merchant ships. They sank the Royal Navy battleships HMS Valiant, HMS Queen Elizabeth, and the heavy cruiser HMS York, the destroyers HMS Jervis and HMS Eridge, and 20 merchant ships including supply ships and tankers. During the course of the war, the unit has been awarded the Golden Medal of Military Valor and individual members have been awarded 29 Golden Medals of Military Valor, 104 Silver Medals of Military Valor and 33 Bronze Medals of Military Valor.

Chronicle of Operations

The Gondar in the process of sinking
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The Gondar in the process of sinking

Once inside the Bay, the 6 boats pinpointed their targets, a Heavy Cruiser, HMS York, a large tanker, the norwegian Pericles (8300 Tons), and another cargo ship. Two MTMs hit the York amidships, flooding her aft boilers and magazines. Two british sailors lost their lives in this action. The Pericles was also hit and broken in two. The other barchini apparently missed their intended targets, one of them finishing stranded in the beach. The daring italian sailors were taken prisoners. The disabled York was finally scuttled by her crew before the fall of Crete in German hands. The Pericles sank while taken in tow by RN destroyers trying to make Alexandria in May.

Image depicting the beached HMS York inspected in 1942 by a boarding party from the Italian escort destroyer Sirio
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Image depicting the beached HMS York inspected in 1942 by a boarding party from the Italian escort destroyer Sirio

This drawing shows a norwegian tanker broken in two by Olterra manned torpedos, August 1943
Enlarge
This drawing shows a norwegian tanker broken in two by Olterra manned torpedos, August 1943

See British commando frogmen#1944 for a further underwater action that those Italian frogmen took part in.

Admiral Karl Dönitz and Junio Valerio Borghese planned to attack New York using midget submarines, but this attack never happened.

See Italian commando frogmen for Italian commando frogmen after 1945.

Continued Participation in the Axis

A Xª MAS female auxiliary recruitment poster, featuring a woman kissing the Italian Social Republic war flag
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A Xª MAS female auxiliary recruitment poster, featuring a woman kissing the Italian Social Republic war flag

Some Xª-MAS men who were in German-occupied land remained part of the Axis forces, joining the Italian Social Republic under the command of prince Junio Valerio Borghese, also known as the "Black Prince". The Xª MAS negotiated with the German Armed Forces a deal that gave them ample autonomy, allowed them to fight under an Italian flag, under the command of the German Armed Forces. Borghese was recognized as the leader of the corp. [link]

Ideology

The main themes in the Xª MAS's ideology became "honour" in defending Italy from the "betrayal" of the armistice with the Allies, strong anti-semitism in the wake of stronger Nazi influence, and a call to defend the territorial integrity of Italy against the Allies. This was quite ironic, as the Third Reich was already stripping some Italian northeastern territories and integrating them directly in the Reich under the names of Alpenvorland and Adriatisches Kustenland.

The corp had its own weekly magazine, L'orizzonte ("The Horizon"), in which authors like Giovanni Preziosi wrote vehemently anti-semitic articles about Jewish conspiracies. The magazine had problems in its distribution, as it was thought that Borghese's popularity among the fascist hardliners might damage Mussolini's. [link]

Relation to the RSI

Relationships with the Italian Social Republic were not easy. On January 14, 1944 Mussolini tried to arrest Borghese while receiving him in Garniano, to gain direct control of the Xª MAS. Word of the arrest by chance reached the command of the Decima, whose local command evaluated the idea of marching on Salò. The German command had likely a role in resolving the situation, since they needed the equipment and expertise of the Xª MAS in the Adriatic sea, where the Germans had no marine equipment of their own. Ref. [link] (in Italian).

Assignments

Ferruccio Nazionale, a partisan, hanged by Xª MAS. The sign says "He attempted to hit with weapons the Decima"
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Ferruccio Nazionale, a partisan, hanged by Xª MAS. The sign says "He attempted to hit with weapons the Decima"

The Germans used them mostly in anti-partisan actions on land, rather than against the Allies at sea. The Xª MAS became infamous for the numerous war crimes both on partisans and civilian population alike. They are generally considered to have been similar in ferocity to the SS, and it is with this part of their history that most Italians connect the Xª MAS today.

Their war crimes usually took place in small villages, where the partisans were stronger; for example:

When the war in Italy was nearing its end, the Xª MAS moved its headquarters to the Piedmont and tried to finance itself on the black market. On April 26, 1945 in what is now the Piazza della Repubblica in Milan, Borghese finally ordered the Xª MAS to be disbanded. Borghese then manage to flee to Rome, helped by the American secret services, leaving many of his previous companions in the hands of the resistance.

External links

 


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