In July the battery switched to Second Army in the Ypres Salient, supporting the Third Ypres Offensive. This made little progress until Second Army took over its direction for the battles from the Menin Road to Passchendaele, when it bogged down in the mud. On 14 December the battery was joined by a section from 183rd Siege Bty, bringing it up to a strength of six howitzers with 69th HAG. By now HAG allocations were becoming more fixed, and on 1 February 1918 the 69th was converted into a permanent RGA brigade. The battery stayed with 69th Bde until the Armistice a year later.
