November 1915 to the island of Lemnos and then onto England, where he spent several months in various hospitals around the country. In the meantime, the New Zealand Division had been formed and needed its allotted complement of New Zealand Engineers. To achieve this, the Field Troop was disestablished, with its personnel forming the basis of the 3rd Field Company and reinforcements bringing it up to strength. Western Front On recovering his health, in April 1916 Forsyth was posted to the NZEF base at Étaples before rejoining the 3rd Field Company, now serving on the Western Front in support of the New Zealand Division's 3rd Infantry Brigade. Later in the year he spent a period of leave in the United Kingdom and struck up a relationship with a Glaswegian, Mary, who he soon married. From mid-September 1916, during the New Zealand Division's involvement in the Battle of the Somme, Forsyth's company was heavily engaged in construction of roads and strongpoints and then from early October was stationed in Armentieres, now attached to the 2nd Infantry Brigade. The 3rd Field Company worked to improve the defences of the sector, which included the construction of several small dams to direct excess water towards the German trenches. Forsyth was promoted to acting corporal in March 1917 having been made an acting lance corporal late the previous year. The 3rd Field Company was involved in the Battle of Messines of June 1917, following the infantry and constructing strongpoints in front of the village of Messines once it had been captured. During the following operations around the village of La Basseville, Forsyth was officially noted for his service. From early October, the New Zealand Engineers was involved in the maintenance of the roads during the Battle of Passchendaele, and later that month the 3rd Field Company helped in the consolidation phase of the Battle of Poelcappelle and in sorting out lines of communications and retrieving wounded in the subsequent First Battle of Passchendaele. The following March saw the commencement of the German spring offensive and the involvement of the New Zealand Division in holding the frontline. The New Zealand Engineers built and improved defensive positions during this time. By the end of this defensive phase of the fighting, Forsyth had attained the rank of sergeant, having been promoted to this rank on 15 May 1918. In late August 1918, Forsyth was on a temporary attachment