Shortly before 5am on the 21st March 1918, the mighty German force comprising four armies of 27 divisions and supported by the biggest artillery barrage of the war with more than three million shells fired in five hours, fell upon the central Allied position between Arras and St. Quentin held by the British Third & Fifth Armies, in what was known as Operation Michael and the start of the German Spring Offensive, or ‘Kaiserschlacht’. Aided by the foggy conditions the German Stormtroopers were able to penetrate deep into the British lines. By the end of the first day, the British had lost 7,500 dead and 10,000 wounded and the Germans had broken through at several points on the front of the Fifth Army. After two days the Fifth Army was in full retreat. As they fell back, many of the isolated redoubts were left to be surrounded and overwhelmed by the following German infantry. The right wing of Third Army became separated from the retreating Fifth Army, and also retreated to avoid being outflanked.
Within days the ferocity and speed of the German Spring Offensive saw the advancing divisions achieve territory gains on the Western Front not seen since 1914 and the formation of the trench systems that ran the length of the front. News began to come in that the German Army were now fighting in High Wood, within a short distance of Pozieres where two summers previous I Anzac Corps fought its bloodiest battle. In fact the British front was broken with the Fifth Army driven back and the serious danger of the separation of the British and French Armies. The orders coming through to the Australian divisions were now in a tone reflecting the seriousness of the situation and that everything must be done to halt the Germans, and for many, at last, this was the very job for which they had enlisted and gone overseas.