I can believe that.
We took a veteran of 1940, from the Northumberland Fusiliers over for the anniversary year before last, and he said that when they set up their Vickers, the Germans drove mortar teams up in m/c combos and starting mortaring them. The Vickers had a very distinctive signature. I am sure this is why British MG coys included mortars of their own to counter this.
Thanks for the compliment by the way.
BB