[4] In 1859, the Mullan Road was under construction to connect the Upper Missouri River portion of Fort Benton, Montana to the Pacific Ocean.

The field work was unique because it would be the most detailed record of the Shields and Yellowstone River trail systems and geography.

Their report of their field work in the spring and autumn seasons of 1859 and 1860 would not get filed until 1867, as both Raynolds and Maynadier were called to serve in the American Civil War.

He received a response from Brulé leader Spotted Tail, and agreed to the burial of his daughter, Ah-ho-ap-pa, at Fort Laramie.

[3][7] His actions at Fort Laramie earned Maynadier the distinction of brevet major general for "accomplishing much toward bringing about peace with the late hostile tribes".

They latter occupied Summerville, South Carolina, Montgomery, Alabama, Fort Pulaski and Savannah, Georgia during the Reconstruction era.