Transport Ship Tonnage Losses during CRUSADER

Transport Ship Tonnage Losses during CRUSADER


In a prior entry at this link I posted the arrival information for freight in North Africa by month, from the Italian navy’s official history. This entry will complete this information by adding monthly merchant and military (where used for freight transport, not escort – but see note on December) tonnage losses on the Libya route. I am presuming that German merchant vessels lost are included.


Merchant unloading in a North African port, 1941. Original color. Collection

A Note on the Numbers

The presumption is that the difference between ‘sent’, ‘lost’ and ‘returned’ does not sum up, but instead included the tonnage that abandoned the crossing attempt as well. This is a particular important caveat in November, when the large convoy ‘C’ returned to port in Italy after it had been attacked from the air and by submarine, while the damaged Iseo and tanker Volturno also returned to port. In December convoy M.41 was abandoned, and replaced with M.42. This convoy finally brought over vessels from the abandoned ‘C’ convoy. A separate post on successful voyages in November 41 can be read at this linkNumbers for returned tonnage are thus lower not just because of the losses, but also because vessels returned to port, or because they were damaged and needed longer repairs.

I believe the cabotage voyages are not included in these statistics, and neither are smaller vessels such as motor-schooners, caiques from Crete or German F-Lighters.

Monthly Statistics


  • Sent 161,043 tonnes
  • Lost  54,011 tonnes (33.5%)
  • Returned 35,042 tonnes
  • Lost 0 tonnes
  • Difference 71,990


  • Sent 79,930 tonnes
  • Lost  31,436 tonnes (39.3%)
  • Returned 30,266 tonnes
  • Lost 6,311 tonnes (20.9%)[3]
  • Difference 11,917


  • Sent 107,602 tonnes
  • Lost  13,098 tonnes (12.2%)[4]
  • Returned 71,532 tonnes
  • Lost 5,741 tonnes (8.0%)
  • Difference 17,231

Total November – January 1941/42

  • Sent 366,177 tonnes
  • Lost  98,545 tonnes (26.9%)
  • Returned 136,840 tonnes
  • Lost 12,052 tonnes (7.4%)
  • Difference 101,861

Total Movements

  • Sent + Returned 503,017
  • Total lost 110,597 (22%)

As part of their very useful statistics, the USMM also provides success information by type of attack, even though this is not elaborated on further (e.g. how they counted joint attacks by air/surface, such as on Iridio Mantovani on 1 December). These numbers seem only to relate to actual attacks, not sorties.

Attack Statistics by Attack Mode 1940-43

  • Surface vessel – 10 attacks, 100% success rate[5]
  • Submarine – 33% success rate
  • Aerial – 32% success rate


[1]Most of these losses fell on the Beta– or Duisburg convoy which was entirely destroyed.  But other ships were lost as well, such as Capo Faro to air attack on 30 Nov.

[2]The numbers here could be inflated by the loss of two Italian light cruisers da Barbiano and di Giussano with between them over 13,000 tonnes on 13 December. On the other hand, just adding up the losses of Iridio Mantovani, Adriatico, Fabio Filzi and Carlo del Greco, gets us to 26,189 tons, so it appears that the cruisers were not in fact included.

[3]This was Sebastiano Venier, torpedoed by HM Submarine Porpoise and beached on the Greek coast on return from North Africa, with Prisoners of War on board. A lot of detail on her loss and the consequences can be found at this link. I can state with reasonable confidence that while the Royal Navy knew of her passengers before she left harbour (Naval Headlines 159 issued on 8 December 1100 hours states that she was to leave harbour on 8 December 1600 hours with 2,000 POW), it is exceedingly unlikely that the  commander of HMS Porpoise could have known this, since he would have been at sea well before the naval headlines were circulated.

[4]This was the large liner Victoria, sunk by aerial torpedo attack as part of the T.18 convoy on 23 January.

[5] I can identify four (five if attacks on Regia Marina vessels transporting goods are included) of these ten attacks to have taken place during the broader CRUSADER period:

Destruction of the Beta/Duisburg convoy (six vessels)

Sinking of Maritza/Procida

Sinking of Adriatico

Sinking of Mantovani (Adriatico and Mantovani were sunk on the same day, but in separate engagements)