On April 10, the Tennessee and the Swatara, under the command of Rear Admiral James Jouett, arrived at Colón with a battalion of Marines. In Panama City, crowds gathered in Cathedral Plaza to watch the Americans parade about in their smart uniforms, wheeling a Gatling gun this way and that. Only once was there any real excitement. A fight broke out between some of the local citizens; the Gatling was fired across the plaza at an elevation to clear the tops of the buildings and the plaza was emptied in seconds.

