Calibre Aerial Photography were commissioned by a WWI historian and lecturer to provide unique aerial video footage and photography for an area in the somme called the Ancre valley, an area which during WWI was heavily defended by German troops. The 36th (Ulster) Division was an infantry division of the British Army, part of Lord Kitchener’s New Army, formed in September 1914. Originally called the Ulster Division, it was made up of members of the Ulster Volunteer Force, who formed thirteen additional battalions for three existing regiments: the Royal Irish Fusiliers, the Royal Irish Rifles and the Royal Inniskilling Fusiliers. The 36th Ulster Division’s sector of the Somme lay astride the marshy valley of the river Ancre and the higher ground south of the river. Their task was to cross the ridge and take the German second line near Grandcourt. In their path lay not only the German front line, but just beyond it, the intermediate line within which was the Schwaben Redoubt.