 Complete the following phrase:  In early 1918, it undertook a defensive role south of the Ancre, helping to repulse the German spring offensive, a major German offensive that was launched on the Western Front following the collapse of Russia. In early April, the battalion took part in the Second Battle of Dercourt. Later that month, on the morning of 2425 April 1918Anzac Daythe battalion took part in an Allied counter-attack at Villers-Bretonneux, in Belgium. In August, the 50th joined the 