I found the paragraph regarding Arthur at the departure for the Gettysburg reunion in The History of The 24th Michigan:
"Hurrying along the streets of Detroit, on Monday, June 10, 1889, with G. A. R. badges and blue suits, were several hundred survivors of the different Michigan regiments that had taken part in the Gettysburg battle, who had gathered for their departure to the dedication ceremonies. About six o'clock in the evening Arthur S. Congdon of Chelsea, the old bugler of the Twenty-fourth Michigan, blew a familiar call from his battered instrument, on the old Antisdel House steps on Michigan avenue, at which several score of veterans dressed on the flags in the street, under the command of Captain Wm. R. Dodsley. Detroit G. A. R. Post No. 384 was present, besides the six Detroit companies of State troops, headed by their regimental band, as escorting organizations to the cars. The column was joined by the cavalry contingent which sedately marched to the depot. It was the supper hour, and the tens of thousands were not present who lined the streets upon the departure of the Twenty-fourth for the war twenty-seven years before."
