 Complete the following phrase:  During the American Civil War, the Confederate ironclad CSS Arkansas was completed at a makeshift shipyard in Yazoo City after the Confederate loss of New Orleans and Memphis. During her short career, the Arkansas challenged the Union navys control of the Mississippi River and helped avert the early fall of Vicksburg. On May 21, 1863, as a Union fleet steamed up the Yazoo River, the Confederate forces burned down the shipyard to keep their foes from capturing the vessels being built there. The Federal forces then burned down the sawmill and lumberyard before withdrawing. After their 