 Nokupinda kweGermany muFrance uye nyika dzepasi musi wa 10 May 1940 BEF yakapinda muBelgium kuzosangana nemauto eGermany akanga achifambira mberi. Yakagoverwa kumaodzanyemba pamberi peMaginot Line, 51st Division yakanga isiri chikamu chesimba rinobatanidzwa muBelgium, uye nokudaro haana kubatanidzwa mukubviswa kwaDunkirk. Mukupindura kuGermany mberi kwakatorwa kuti iite mutsara wokudzivirira pamwe neSomme, uko yakasungirirwa kuFrench Tenth Army. Nokubva kwemauto eAllied paDunkirk, vaGermany vakafunga nezvekumaodzanyemba. 