Edwin Buckingham Coolidge was a resident of Mansfield on November 4, 1862 when he enlisted as a Private in Co. B of the 5th Regiment Connecticut Volunteer Infantry. He was wounded July 20, 1864 at Atlanta, Georgia and mustered out July 19, 1865.

He was born September 24, 1836 in Erving, Massachusetts to Wendell and Emma (White) Coolidge. After the Civil War, he succeeded his father in the furniture business, establishing a factory in Willimantic. Edwin Coolidge was a resident of Ashburnham, Massachusetts in January of 1860 but he is not found in the 1860 U.S. census in Massachusetts or Connecticut. In the 1870 U.S. census in Willimantic, he is a 34 year old refinisher of furniture and head of household. He moved to East Hartford about 1874 and resided there for 25 years. The last seven years of his life, he was a resident of Hartford. Edwin Coolidge was a cousin of Civil War Governor William Buckingham. Fitch Soldier Home records indicate that he died there, but his obituary stated that he died at Hartford Hospital. 

Edwin B. Coolidge married Josephine A. _____, born in Templeton, Massachusetts about 1855. Children include: Charles W. Coolidge, born July 17, 1857 and Francis Coolidge, born January 19, 1860. He married, second, Mary Josephine Potter of Griswold in 1867. Children include: Clarence Edwin Coolidge, born April 6, 1870; Nellie Isabel Coolidge, born January 29, 1872; Addie Emily Coolidge born July 24, 1873; Ellsworth Coolidge, born 1875, died 1877; Walter Bixby Coolidge, born November 13, 1877; Mary Button Coolidge, born December 19, 1879 and  Susan Lois Coolidge, born November 28, 1883.

On November 29, 1878, he applied for an invalid pension, No. 263,232 that was granted under certificate No. 159,728. His widow applied for a pension on August 6, 1906.

Edwin B. Coolidge died on July 31, 1906 at Hartford Hospital in Hartford, Connecticut and is buried at Center Cemetery in East Hartford, Connecticut.