The photo above shows men of Britain's new Militia being given intensive gunnery training on the artillery range 1939.

Artillery Training - 1939

A British Anti-Aircraft gunner stands ready as training continues during the "Phoney War" of 1939

British Anti-Aircraft Gunner

At Louvain, three divisions of the British Expeditionary Force were in position on the Belgian right flank by May 13, 1940.  Troops of the French 1st Army held the line from Wavre to Namur, with the French 9th and 2nd Armies continuing to the Maginot Line.  When German Panzer divisions broke through and took Sedan on May 13, the Allied line from Antwerp to Namur was abandoned and a retreat executed to the Escaut.  The three British soldiers of the this anti-tank gun crew await the first glimps of German Panzers down the road.  Whether these men survived the encounter or not is now lost in history but I would think their chances would be rather slim.   