I recently got a hold of "Warfare in Ancient South Arabia: 2nd - 3rd c. AD" by A.F.L. Beeston, which is an annotated collection of epigraphical sources relating to warfare from the specified time period. This was the first time that details of campaigns were given in dedications, and so these reveal quite a bit of information about warfare in general. Are you making use of these sources for the Sabaeans in EBII? Of course, this relates to a period chronologically removed from the EB timeframe, but it seems that few elements of South Arabian warfare changed in the mean time, so much of the information is still very relevant.