 Complete the following phrase:  She was fitted out as a ram at Pittsburgh and headed down the Ohio River 29 April to join a fleet of rams which Ellet was organizing to counter the Confederate River Defense Fleet. This group of southern rams had been fitted out in the lower Mississippi and threatened to emulate the dreaded southern ironclad ram Virginia in routing wooden hulled Union ships. On 10 May the Confederate flotilla made a spirited attack on Union gunboats and mortar schooners at Plum Point Bend, Tennessee, sinking and forcing the Mound City aground. A fortnight later all but one of the rams had joined the Union flotilla above Fort Pillow ready for action. As the ram fleet and Western Flotilla prepared to attack, General Hallecks 