this pack includes one cannon from the time of Napoleon, a core model for it, a box for cores, a battering ram and a catapult.
All models are available in 4 formats: .fbx .obj .stl.
This is the first time I post models, so I can do something wrong.
STL (Stereolithography, filesize: 1.76 MB), OBJ (OBJ, filesize: 1.86 MB), FBX (Autodesk FBX, filesize: 705 KB)