Given how we gamed the North African campaign, we used "minimalist" units. For example, an artillery regiment would equate to 6-25pdrs and 6 quad gun tractors. An Anti-Tank Regiment would be 9-2pdrs on portees. A medium gun regiment would have 4-4.5in guns and 4 tractors. An early tank battalion (later, called a regiment) would have 13-Cru.Mk.II's.