My grandfather, Anson F. Ingels, lived in Hamilton county, Fillmore county and Richardson county in Nebraska. He had a brother, Arlo Ingels. If the Fremont you mention is the one in Nebraska, there may be chance that your A.H. Ingels is Arlo Ingels.
My records show Arlo S. Ingels born 1881. There was another brother, Evert Ingels. Arlo and Evert were interested in horses and did horse training and horse trading. In World War I they bought horses for the US Army.