Lyman Gibson Bennett enlisted in the 36th Illinois Infantry in 1861. Prior to the War he trained as a surveyor and civil engineer, working for the railroad. The military utilized Bennett’s skills as a cartographer, and assigned him to survey battlefields, road systems, and fortifications. Bennett’s diaries document his daily duties as both a soldier and an engineer for the military. His regiment participated in the Battle of Pea Ridge, which he describes in vivid detail. Bennett was discharged from the military in August 1864.

In 1865, Bennett joined the engineering department of General Samuel R. Curtis as a civilian. He mapped the 1864 battlefields of Sterling Price’s Missouri Expedition. Bennett was then assigned to survey fortifications in Nebraska and Colorado, and eventually served as an engineering officer on the Powder River Expedition of 1865. Bennett’s diaries provide colorful insight to his perception of the Ozarks and its inhabitants.