Meanwhile Van Dorn and Sterling Price, thinking it was now or never for Missouri, decided to attack Curtis. They had fifteen against ten thousand men, and hoped to crush Curtis utterly by catching him between two fires. But on the seventh of March the Federal left beat off the flanking attack of McCulloch and McIntosh, both of whom were killed. The right, furiously assailed by the Confederate Missourians under Van Dorn and Price, fared badly and was pressed back. Yet on the eighth Curtis emerged victorious on the hard-fought field that bears the double name of Elkhorn Tavern and Pea Ridge. This battle in the northwest corner of Arkansas settled the fate of Missouri. A month later the final attack was made on Island Number Ten. Foote's flotilla had been at work there as early as the middle of March, when the strong Confederate batteries on the island and east shore bluffs were bombarded by ironclads and mortarboats. Then the Union General John Pope took post at New Madrid, eight miles below the island, on the west shore, which the Confederates had to evacuate when he cut their line of communications farther south. They now held only the island and the east shore opposite, with no line of retreat except the Mississippi, because the land line on the east shore was blocked by swamps and flanked by the Union armies in western Tennessee. On the night of the fourth of April the _Carondelet_ started to cut this last line south. She was swathed in hawsers and chain cables. Her decks were packed tight with every sort of gear that would break the force of plunging shot; and a big barge, laden with coal and rammed hay, was lashed to her port side to protect her magazine. Twenty-three picked Illinoisian sharpshooters went aboard; while pistols, muskets, cutlasses, boarding-pikes, and hand grenades were placed ready for instant use. The escape-pipe was led aft into the wheel-house, so as to deaden the noise; and hose was attached to the boilers ready to scald any Confederates that tried to board. Then, through the heart of a terrific thunderstorm, and amid a furious cannonade, the _Carondelet_ ran the desperate gauntlet at full speed and arrived at New Madrid by midnight.