History of the Fifth Massachusetts Battery
Page 755 a diary entry calls the 20th Maine "a jolly set of fellows"
Page 835 a letter from Chamberlain recounts some incidents at North Anna on May 24th, 1864.
The Battle of Petersburg is mentioned on pages 869 - 873, 876 - 881
A porton of this history quoting the history of Battery B Fourth US Artillery
The Fifth Massachusetts supported Sweitzer who was on Chamberlain's right in the attack on June 18th.