At 4:30 p.m. on April 21, after scout Deaf Smith announced the burning of Vince's Bridge (cutting off the primary avenue of retreat for both armies), the main Texan battle line moved forward. A fifer played the popular tune "Will you come to the bower I have shaded for you?" General Houston personally led the infantry, posting the 2nd Volunteer Regiment of Colonel Sidney Sherman on his far left, with Colonel Edward Burleson's 1st Volunteer Regiment next in line. In the center, two small brass smoothbore artillery pieces (donated by citizens of Cincinnati, Ohio, and known as the "Twin Sisters,"...