little more was achieved before the fighting ended on 10 November. On 19 December 137th Hvy Bty battery was ordered to 51st HAG, which it joined on 15 December, remaining with it for the rest of the war. This HAG was with Fourth Amy (which was taking over the Ypres sector from Second Army HQ). Spring Offensive The HAG became permanent RGA brigades on 1 February 1918, with 51st being designated a 'Mixed' brigade consisting of two batteries of 60-pdrs (137th (Deptford) and 138th (Hampstead)) and four heavy howitzer batteries of various calibres. 51st Brigade moved back to Fifth Army in March. 137th Hvy Bty was supporting III Corps when the German Spring Offensive fell on it on 21 March. Here the British line was at its thinnest and the fog at its thickest. The battery's FOO, Lt L.P.G. Bremner, remained in his OP near Urvillers, just south of St Quentin, despite his telephone line being cut by enemy shellfire. After the British Forward Zone had been overrun, the German barrage began to advance again about 10.30. Bremner watched small balloons flying above the mist, marking the positions of the advancing German infantry, until they got within of his OP, when he destroyed his papers and made his way back. Meanwhile 138th Hvy Bty also lost communication with its OP in Fort Vendeuil and fired its 60 pdrs blind until the mist cleared about midday, when it could engage the captured strongpoint. A number of RGA units were either caught in the fighting or forced to abandon their guns as the Germans advanced rapidly. Others struggled to get their guns back during the 'Great Retreat' Fourth Army HQ took over all of Fifth Army's formations and units on 2 April, and the first phase of the German offensive was halted on 4 April. Further attacks came on other parts of the front, but none broke through completely. 51st Bde formally came under Fourth Army again on 1 May and stayed with it until the end of the war. Hundred Days Fourth Army launched the Allied Hundred Days Offensive on 8 August with the Battle of Amiens. The battered divisions of III Corps only had modest objectives, but despite excellent artillery support and CB fire they still made little progress, so on 10 August part of its front including 51st Bde was transferred to Australian Corps. During August and September Fourth