 Complete the following phrase:  At Loos in January and February 1916 they got their introduction to trench warfare and suffered greatly in the Battle of Hulluch, 2729 April, during the Easter Rising. They raided German trenches all through May and June, and in late July were moved to the Somme Valley where they were intensively engaged in the Battle of the Somme. The 16th division was critical in capturing the towns of 