Captain D. Sutherland's War Diary of the Fifth Seaforth Highlanders is a gripping and deeply personal account of World War I through the eyes of a Scottish officer in one of Britain's most storied regiments. Chronicling the experiences of the 5th Battalion, Seaforth Highlanders, part of the legendary 51st (Highland) Division, this diary captures the unrelenting brutality, grim humor, and stoic resilience of trench warfare on the Western Front. From the mud and blood of the Somme to the devastation of Arras and Ypres, Sutherland documents front-line life in vivid detail: patrols under fire, night watches, sudden bombardments, and the daily struggle to maintain morale and humanity amidst the chaos. But beyond battle accounts, he records the small moments—camaraderie, letters from home, the scent of pine in a ruined wood—that remind readers of the soldier's enduring will to live and connect. The diary's authenticity, free of patriotic bluster, presents war as it was lived: terrifying, monotonous, and occasionally absurd. War Diary remains an indispensable primary source for scholars, descendants, and students of World War I, preserving the Highland soldier's voice with clarity, grit, and heart.