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.
Terragenesis has an inspirational little piece on cobbing together bits to make neat looking science fiction big guns and artillery pieces.
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.