Some varied examples of artillery used by the Federation:
The main light howitzer of the Federation Army during the First Great War, the M1912 was chambered for 100x176mm (3.9 inch). Weighing in at little over 1,300kg with steel wheels designed for horse towing and featuring a maximum range of 7.9km with HE, Smoke and Gas rounds, it was a fairly unremarkable weapons system overall.
Designed and built using lessons learned from the First Great War, the M1919 would stay in frontline service until 1948, and in reserve service until 1979. Chambered for the new 105x209mm (4.1 in) shells, its L/25 barrel was able to lob rounds out to 10.6km. By the time of the Second Great War, an improved model had been introduced, changing out the steel rimmed wheels for tires for motorized travel.
The eventual replacement for many of the lighter artillery systems, the M1952 'universal' howitzer would see use as light artillery, pack howitzers, and in self propelled guns. Firing a the same 105x372mm shell as the M1932, M1943 and M1946 howitzers (not completed yet, will be added at a later date), the M1952 could achieve a range of 10km with HE and Smoke shells out of its L/17 barrel. The M1952 is still in service with reserve units, and with the Stormkold Defense Force.
Bonus: a First Great War era heavy artillery gun, the M1913 240mm (9.4inch) howitzer. These would be used during the First Great War as a means to target more reinforced areas of the front, and would fulfill a much more secondary role near the maximum of their 25km range during the Second Great War, mostly being used for counter battery fire, and during the 3 month Siege of Gram in 1942