After the outbreak of the American Civil War, Bennett joined the 12th Wisconsin Infantry Regiment and fought in the Battle of Vicksburg before being severely wounded by the accidental discharge of his own gun.
[4] After the war, the wound prevented Bennett from returning to carpentry, so in 1865 he bought the Kilbourn City photography studio operated by Leroy Gates and began a career as a photographer.
Realizing that the three-dimensional aspect of the rock formations would be lost in two-dimensional photographs, he began creating stereoscopic images that allowed viewers to see the Dells in three dimensions.
In the meantime, he continued to innovate in the field of photography by inventing a stop action shutter which allowed him to take photographs of instantaneous events.
Bennett received much attention for his advanced techniques, and was commissioned by the Chicago, Milwaukee & St. Paul Railroad to photograph the landscape along the company's track in Wisconsin.
Nevertheless, Bennett pressed on in his profession, selling gift shop type items from his studio to attract more customers and continuing as a professional landscape photographer until his death from Bright's disease in 1908.