 Complete the following phrase:  At Loos, in January and February 1916, the division was introduced to trench warfare and suffered greatly in the Battle of Hulluch. Personnel raided German trenches all through May and June. In late July they were moved to the Somme Valley where they were intensively engaged in the Battle of the Somme. Lieutet General Hubert Gough, the British Fifth Army commander, had asked, at the end of 1915, for the division to be placed under his command, and had established the first corps school for the training of young officers. The 16th Division played an important part in capturing the towns of 