Official records indicate that Sindall enlisted in the Confederate Army at Richmond, Va., on June 27, 1861. He volunteered for the 1st Maryland Artillery, which was composed of men from lower Maryland, the Eastern Maryland Shore and Baltimore City. After four months, he was detached to the staff of Gen. Samuel G. French.
In the same area of Texas and New Mexico that Sindall roamed with Pope's expedition, French was a Captain of the Quartermaster Department. French had the duty of maintaining Wool's Road west out of San Antonio and diverging northward toward Las Moras Creek, the San Pedro and the Pecos. Pope's drilling equipment was acquired through the Quartermasters in San Antonio and Las Cruces, N.M. (see the "Trading Post" section in the May 1857 issue of National Driller).