The Maginot Line - A misunderstood history

Canon-obusier 75mm Mle 1932

Gun-howitzer (casemate mounted)

This fast firing, short recoil artillery piece was a descendant of the famous ’soixante-quinze‘ (75mm model 1897).

The 75mm gun-howitzer model 1932 was a rapid-firing, short recoil gun designed to equip flanking casemates of artillery ouvrages. The model 1932 was an improvement over the model 1929, which had the disadvantage of it’s long tube (1.50m), which made a massive overhang above the embrasure necessary, in order to protect the barrel from artillery grenades.

75mm Gun Howitzer model 1932
Barrel length242 cm
Traverse45
Elevation-9 to +40'30'
Range11.900 m
Rate of fire (normal)13 rpm
Rate of fire (max.)25-30 rpm
Max. range 11,9km

The model 1932 had a tube that was 30cm shorter than the one of the model 1929, and it protruded only 45cm from it’s embrasure. Armoured shutters This had the advantage that, to further protect the barrel from enemy fire/bombs, two armoured shutters (controlled from the inside by contra-weights) could be installed to hide them from sight while closed.

The gun-howitzer was initially equipped with a Nordenfeld type breech but later, it was replaced by a semi-automatic breech model SA 1933.
The advantage of the latter was that it completed a number of actions automatically.
The breachblock closed after the cartridge had been loaded, it opened once the round had been fired and it ejected the empty cartridge case.
The Nordenfeld automated only one action, namely ejecting the empty cartridge case.