The M18 is indeed very cheap, and a good way to sneak in an extra order die. But in a force that lacks HE (not a criticism, just a fact since you have limited figures and points), then I am not sure a 1″ burst is going to make much of an impact in any sense.
[The med/heavy mortar and M18 all have “Fixed” meaning, amongst other things, they cannot move and fire with the same order. However, mortars are Indirect firers so don’t need to use Advance orders to rotate, as they don’t have a facing.]
