In my research on the First World War names on the Dowerin War Memorial I have a David Smith who started in the 44th Battalion and went on to the Y3A Medium Trench Mortar Battery. Unfortunately he has a record like so many men, "taken on strength" followed by "killed in action". Most of them I can fill in with a bit of information about what was happening in the battalion at the time, but here I don't know much more than killed on 22 May 1917 and buried in Strand Military Cemetery in Ploegsteert Wood. Does anyone know how the Medium Trench Mortar Batteries were deployed? Would he have still been where the 44th Battalion were?