The attached is taken from a Canadian Army document issued by the Chief of Staff on 10 May 1944, which is a recommendation to see and retain the attached report dated 12 January from the 8th Army based on research undertaken during the Italian campaign. I found it at War diaries : T-6680 - Héritage. Brave men to get 20 yards from a tank to fire, but many did it.
A prime example of its use: "Fusilier F Jefferson of 'C' Company, 2nd Lancashire Fusiliers in front of a German StuG III assault gun which he knocked out with a PIAT, May 1944." THE BRITISH ARMY IN ITALY 1944 Fusilier Jefferson with his P.I.A.T. mortar: THE BRITISH ARMY IN NORTH AFRICA, SICILY, ITALY, THE BALKANS AND AUSTRIA 1942-1946 More here: jeffersonVC
Alternatively it can be used very successfully for blowing holes in walls when House Clearing.!!! Especially terraced type buildings.