Small numbers of Saint-Chamond howitzers were given to the Serbian and Romanian armies towards the end of World War I.

The German Army captured some Saint-Chamond howitzers after the fall of France and used these mostly as coastal defence guns until the end of World War II.

FAMH (Compagnie des forges et aciéries de la marine et d'Homécourt), commonly known by the FAMH main factory location - Saint-Chamond, developed a 150 millimetres (5.9 in) heavy howitzer[1] as a complementary artillery piece to the Mondragon-designed 75 millimetres (3.0 in) field guns Saint-Chamond had built for the Mexican Army.

This doctrine required that heavy howitzers should deliver an intense bombardment on enemy trench lines just before an infantry attack.

It fired a 43.5 kilograms (96 lb) high-explosive (Obus FA Mle 1915) shell to a range of 9,300 metres (10,200 yd).

The disadvantage of rear-positioned trunnions is that the elevation system must be more robust since it must bear greater forces from the barrel weight.

To reduce the forces on the elevation gearing an equilibrator is necessary, this is usually a spring, or in the case of the Saint-Chamond a pneumatic system.

They arrived in Finland at the beginning of March 1940 and were issued to Heavy Artillery Battery 8, but the war ended before the unit reached the front.

[citation needed] The German Army captured some Saint-Chamond howitzers after the fall of France and used them mostly as coastal defence guns as the 15.5 cm sFH 415 (f) until the end of the war.