Eustace Foster Grant-Dalton was born in 1877. Eustace spent a lot of time at Brodsworth during his childhood with his family, and his cousin Charles Grant-Dalton later inherited the Brodsworth Estate. Eustace was a career soldier, having received his commission in October 1889 into the Prince of Wales Own Yorkshire Regiment. He saw active service in the Boer War and was wounded, but returned to his regiment in 1901. He later served in Ireland and India before being promoted to Captain in 1909 and posted to the 1st Battalion in 1913.
He was among the first soldiers to arrive in France after the outbreak of war in 1914. Eustace was wounded at the First Battle of the Aisne and taken prisoner. He spent the rest of his war in German prisoner of war camps. He continued serving with the army after the war, eventually retiring in 1927. Eustace married the widow of his cousin Charles and spent the rest of his life at Brodsworth until his death in 1977.