USS Alert (1861)
 USS Alert (1861) was a 90 long tons (91 t) steamship named A. C. Powell purchased by the Union Navy during the first year of the American Civil War.A. C. Powell — later renamed Alert and still later renamed Watch — served primarily as a tugboat but at times she performed duty as a dispatch boat ship’s tender and even as a gunboat despite the fact that she had on board only a howitzer instead of a cannon or rifle.