...Pillow. otherwise called Fort Wright, on the Mississippi River, was evacuated by the rebels. After the occupation of the Fort, the Union gunboat fleet steamed directly to Memphis.--(Doc. 54.) Jeff Davis threatened retaliation in the case of Major W. Van Benthuysen, who had been arrested by Gen. Butler, at New Orleans, for aiding the escape of a scoundrel and spy. Brig.-General J. T. Boyle, he...