The Tucson Presidio was established in August of 1775 by Spanish Army Colonel Hugo O'Conor. The soldiers, or soldados, and their families moved north from Tubac sometime during the Fall of 1776. The fort was enclosed with a wood palisade until 1783 when, after a large Apache assault, they surrounded it in an 8-12 foot high adobe wall that was about 700 ft. long on each side.
The Presidio...