He was a member of the infamous "Banditti of the Prairie" in his youth, whose involvement in the torture-murder of Colonel George Davenport in 1845 led to his turning state's evidence against his co-conspirators.
Birch was a self-styled Mormon, who conveniently, used his church membership, as a Latter Day Saint, to gain protection in Nauvoo, Illinois, when the law was hot on his trail.
Robert Birch, more likely, might have had older relatives, such as his father, uncles, or cousins, who were on the Mystic Clan's membership rolls in the U.S. Southern states or were connected to outlaws who were Murrell associates.
After the demise of Murrell, many of the members of the future "Banditti" were driven out of "The South" and to avoid arrest, execution, or death at the hands of regulators and moved farther north, relocating their criminal activities in the still, lawless, frontier of the Middle West, mainly in the states of Illinois, Indiana, and Ohio.
Disappearing into the frontier, of the Midwest United States, Robert Birch resurfaced, almost, a decade later, a reformed, honest man and an associate of Jacob Snively,[4] the founder of Arizona's first gold rush boom town Gila City, and became the first postmaster on December 24, 1858.
An illustration from
Edward Bonney
's book
Banditti of the Prairies
in which Robert Birch and his accomplices in the
Banditti of the Prairie
attacked and murdered Colonel
George Davenport
at his home on July 4, 1845. Birch was later captured and arrested for the crimes and escaped from jail in
Wisconsin
.
Robert H. Birch with his Banditti outlaw partners, William Fox and John Long burying ill-gotten loot
Robert Birch was arrested for his part in the torture-murder of Colonel
George Davenport
but because he broke out of jail in 1847, through outside help or bribery, in
Knoxville, Illinois
his case never went to trial and he vanished without a trace. The October, 1845 hangings of Granville Young and John and Aaron Long, Banditti murderers of Colonel Davenport, from the 1850 book,
The Banditti of the Prairies, Or, The Murderer's Doom!!: A Tale of the Mississippi Valley
by
Edward Bonney
, who is standing to the right of the
gallows
, wearing a top hat and black suit.
A drawing of the infamous
southern
criminal gang leader
John A. Murrell
from the only known, accurate portrait made of him during his lifetime. Robert Birch was said to have had criminal connections with Murrell but this is highly improbable since he would have been only a seven-year-old child or possibly Birch's criminal father was associated with John A. Murrell.