 Complete the following phrase:  The 42nd Division transferred from Adams III Corps to Lieutet General Michael Barkers I Corps on 19 May 1940, nine days after the German Army invaded France, as the division moved into the front line on the River Escaut. On 17 May, Brigadier John Smyths 127th Brigade was detached to join Mac Force, under Major General Noel Mason-MacFarlane, temporarily leaving the division with two brigades, returning on 20 May. After the speed of the German advance, the division, along with the rest of the BEF, was forced to 