A bit safer than you describe, "shoot 81mm suppression over the top of the ingress routes" I.e. there's a route to come in that's a 3D box, with the height typ

A bit safer than you describe, "shoot 81mm suppression over the top of the ingress routes" I.e. there's a route to come in that's a 3D box, with the height typically being low for a variety of reasons (often including rules for anti-air that they can shoot anything higher), and the complete, high arc of the indirect fire 81 mm mortar is over and around that box. Assuming, of course, the right number of propellant charges were used, something done by hand if one or more have to be removed, and it doesn't "land short" for any other reason (failure of all the propellant to burn??? Don't know if/how often that happens).