"Observations on the Disturbances in the Madras Army in 1809" is a historical account written by Major B.D. D'Urban, who served as the Deputy Quarter-Master-General in the Madras Army. The book provides a detailed examination of the mutiny that occurred among the officers of the Madras Army in 1809, focusing on the causes, events, and aftermath of the disturbances. D'Urban's work is based on his personal observations and experiences, offering a unique insider perspective on the mutiny and its implications for the British military administration in India.