All interesting and valid suggestions. Thanks for the response.
I have been using MMG's/HMG's to provide a base of fire for my infantry, advancing in short bounds, generally with the MOVE command.
It occurs to me that the overwatching MG can only engage one target at a time when the ambush is sprung, unless there is a trick to using the NEXT TARGET command that I am not grasping.
Works fine against the AI, but not so well against real people!