Eye Candy time.
Mike Cooper has photos of several World War I dioramas that he has made. There’s Austrian Artillery, one of the Great War in Palestine, a trench mortar and a gas attack model.
artillery
Civil War Artillery Primer
Mike’s Hobby Home has this primer on American Civil War artillery. The information includes a good table on the various pieces, including data on the shot size, range of the weapons, elevation and the number in use.