Comparing: Birch Gun vs. AMX 105 AM mle. 47

In the 1920s, British engineers explored the idea of an SPG on a tank chassis. Development of the vehicle started in 1923 at the Royal Arsenal, Woolwich. It was based on the Vickers Medium Mark II, the chassis of which could carry the required modules. A total of seven prototypes were manufactured and joined the Experimental Mechanised Force established on May 1, 1927. Later, the unit was disbanded, along with the SPG program.

A 105-mm SPG design project developed by the Construction Bureau in Issy-les-Moulineaux (Paris, France). The draft was ready in September 1947. However, development was discontinued and the project was canceled.