...down the river on Sunday, the twentieth of April, but not in a condition to use her motive power with effect. It was hoped that, notwithstanding this, she would be able to assume a position below Fort St. Philip , discovering the location of the mortar boats, and being herself proof against direct fire, dislodge the enemy with her guns, which were of very heavy calibre. Knowing, also, that the incessant bom...