Divisione Motorizzata “Trieste” – before and after CRUSADER

In a previous post linked here, I have added information comparing Italian divisional strength after the CRUSADER battle, comparing it to the authorised strengths of the division.  I recently received Salvatore Loi’s book Aggredisci e Vincerai, the history of the Trieste division.  Most of it is focussed on 1942/43, but there is some good information about the division’s role in CRUSADER in there.  Here I want to use this information to show what the impact of the losses was, by showing the structural change of the division following the battle.

But first a bit of background on the division. It arrived on the big liner convoys in August and September, and suffered 450 killed when Gritti, Oceania and Neptunia were sunk. Loi states that the CO of IX Gruppo of 21 Artigliera died when the latter two were sunk by HMS Upholder. Montanari, the official Italian historian of the war in North Africa, puts the division was around Homs in early September. On 25 October small elements of the division already undertook recce towards Segnali and Mechili. On 8 November the division was in the sector Bir Hakeim-Bel Harmat-Mteifel el Chebir. There is an interesting diary entry at this link from a subaltern in 66 Reggimento Fanteria. The officer writing the diary was posted missing after CRUSADER, he is in the 66 Fanteria casualty list in Loi.

Based on the information in the earlier post, I am presuming Trieste lost about 4,000 men.  It is the nature of losses in battle that they fall largely on the infantry, meaning that while the division as a whole may ‘only’ have lost 22%, the effect at the sharp end is likely to be far more pronounced, and this is shown when looking at the structural change of the division after the battle.  In the case of the Trieste division, it started the battle with 7 infantry battalions and 4 battalions of AA/AT (armi di accompagnamento), and ended it with 6 infantry battalions and 0 AA/AT battalions, a 45% drop in frontline strength. Furthermore, the two infantry regiments went from three companies of 81mm mortars to one per regiment, severely reducing their firepower. The regiment most involved in the fighting, the 9th Bersaglieri lost two battalions, one infantry and its AA/AT battalion.  In the process of the battle, the two infantry regiments lost their regimental mixed AT/AA battalions (my guess is that the guys in these battalions were used to make up numbers in the remaining two infantry battalions), and the divisional AT/AA battalion was also dissolved to provide reinforcements at the end of January.

OOB 101st Motorised Infantry Division Trieste September 1941

Staff

65th Infantry Regiment

2x infantry battalion

1x AA/AT battalion

Motorised transport column

66th Infantry Regiment (as 65th)

9th Bersaglieri Motorcycle Regiment

3x Bersaglieri battalion

1x Bersaglieri AA/AT battalion*

Medical Section

508th AA/AT Battalion (undergoing re-establishment – the battalion may have been disorganised because of losses suffered in transit)

21st Artillery Regiment

4x artillery battalion

1x AA battalion

52nd mixed engineer battalion

90th Medical Section (incomplete – might have suffered losses on transfer to Africa)

176th Supply Section

80th Motorised transport column

This changed as below by the end of the battle:

OOB 101st Motorised Infantry Division Trieste January 1942

Staff

65th Infantry Regiment

2x infantry battalion

1x 81mm mortar company

66th Infantry Regiment (as 65th)

9th Bersaglieri Motorcycle Regiment

2x Bersaglieri battalion (the AA/AT battalion was dissolved at the end of January to bring the rifle battalions up to strength)

508th AA/AT Battalion (dissolved on 22 January with remaining men going to the 65th regiment and the 251st independent gun company)

21st Artillery Regiment

52nd mixed engineer battalion

90th Medical Section (incomplete – might have suffered losses on transfer to Africa)

176th Supply Section

80th Motorised transport column

*According to a contemporary source provided by Michele, the  “Battaglione di armi anticarro e di accompagnamento” (=”antitank weapons and support weapons batalion”) in theory had a contingent of about 600 men, and consisted of:

– 1 HQ-platoon
– 1 AA company (20 mm)
– 1 towed AT company (47mm)
– 1 mortar company (81 mm)
– 1 MG company (probably Breda MGs on tripods)

Source: “Nozioni di organica per i corsi allievi ufficiali di complemento”, S.M.R.E., Roma, Luglio 1941-XIX, page 50.