During the winter 6th HAG became 6th Bde, and 245th Siege Bty was brought up to a strength of six howitzers. One of the most serious breakthroughs of the German offensive of 21 March 1918 occurred in front of 245th Siege Bty, and it was forced to pull out hurriedly with the loss of half its guns. It took part in a rearguard action at Mont Saint-Quentin, where 16th (Irish) Division covered the Somme crossings. It got back with one gun, which it handed over to another battery and went to the rear to re-arm and refit. In April 6 Bde was supporting Australian Corps and III Corps when the Germans made a thrust at Villers-Bretonneux) All the guns were brought to bear and the attack was halted, then driven back by counter-attack.