Peticolas was was born on May 27, 1838, in Richmond, Virginia.. In 1859, he came west to Victoria, Texas, where he set up a law partnership with Samuel White.
On September 11, 1861, he joined the Confederate Army. Peticolas enlisted in Company C of the Fourth Regiment of Texas Mounted Volunteers,. This was part of Henry Hopkins Sibley's Army of New Mexico, a brigade with which Sibley intended to capture the rich Colorado gold fields, then secure the gold and harbors of California for the Confederacy. Throughout his time in New Mexico, Peticolas kept a diary in which he set down his keen observations about the country through which he traveled. He was also an artist and sketched his surroundings. The diary filled several books, the first of which was destroyed when the wagon in which is was stored was burned.
The Confederate, Mexican, Spanish, and American flags, flew over Albuquerque's Old Town representing all the governments that had controlled the town. In 2015, deemed too controversial, the stars and bars were taken down.
While he is not represented in Jennifer Bohnhoff's trilogy of novels about the Civil War, his material was instrumental in shaping the narrative and illuminating it with the little details that make historical fiction feel accurate.