Field Marshal Sir Douglas Haig was a British Army officer born on June 19, 1861. He is best known for his role as the commander of the British Expeditionary Force during World War I, particularly during the Battle of the Somme and the Battle of Passchendaele. Haig's leadership style and strategies have been subjects of both praise and criticism. Haig was promoted to Field Marshal in 1917 and played a significant role in the planning of major offensives. Despite facing challenges and heavy casualties, he believed in the importance of attrition warfare. He passed away on January 29, 1928, leaving a complex legacy in military history.