A city official confirmed on Tuesday that Viola, an elephant scheduled to appear on stage at Jordan World Circus in Butte, Montana, had escaped and was wandering through the city, stopping traffic, knocking over fences, and defecating in yards. J.P. Gallagher, the county’s chief executive, said that one of the circus elephants managed to escape from its trainer and soon found its way onto Harrison Ave, a bustling street in town. A social media video shows Viola traveling through traffic in a southwest Montana community. The footage also shows people beside her as she passes the town’s casino a…