In 1865, Mr. Chapin was elected Mayor of the city of Cleveland. The honor was not only unsought, but he was in entire ignorance of the whole affair until after his election. His name had not been mentioned in connection with that or any other office when he left the city on a business trip that kept him absent for several days. In the meantime the nominating convention of the Union Republican party was held, and there was some difficulty as to a choice between the persons named for the nomination as Mayor. In casting around for a way out of the difficulty, the name of Mr. Chapin was mentioned and instantly met with favor. He was nominated, elected by a strong majority, and the first intimation he received of the movement was reading the election returns in the Cleveland Herald, on his homeward journey. He accepted the office in the spirit in which it had been conferred upon him. He understood that the people believed he was disposed and able to manage the affairs of the city vigorously and honestly, and he was not disposed to evade the responsibilities of the office. His time was devoted to the duties of his position, the different departments under his charge were carefully scrutinized, and whilst his strictness and vigorous execution of the laws made the offenders complain of his severity, there was no question raised as to his ability, integrity, or honest zeal for the city's interest. He discharged the duties of his office with scrupulous exactness, and he endeavored to make others do the same. During his administration it was no longer a reproach that the ordinances of the city stood "Like the forfeits in a barbers shop, As much in mock as mark." At the breaking out of the war, Mr. Chapin took an early and active part in stirring up the people to defend the Government of the Union. Wherever his money, influence, or active energy could be made serviceable, there he was always to be found. Having obtained the appropriation for the Twenty-Ninth Regiment, he worked diligently in raising, equipping, and sending it to the field, and spent much of his own time at the front in various capacities. The ladies who worked diligently for the comfort of the soldiers and the care of the sick and wounded, through the medium of the Ladies' Aid Association, found in Mr. Chapin an indefatigable assistant. He was ever ready with suggestion, active aid, and money, laboring day and night, either at the front, in the hospitals, or at home, in behalf of the soldier.