At Annapolis, General Butler's great executive qualities came into prominence. He was placed in command of the "Department of Annapolis," and systematically attended to the forwarding of troops and the formation of a great army. On May 13, with his command, he occupied the city of Baltimore, a strategic movement of great importance. On May 16, he was commissioned major-general, and on the twenty-second was saluted as the commander of Fortress Monroe. Two days later, he gave to the country the expressive phrase "contraband of war," which proved the deathblow of American slavery. A skirmish at Great Bethel, June 10, was unimportant in its results except that it caused the loss of twenty-five Union soldiers, Major Theodore Winthrop among the number, and was a defeat for the Northern army. This was quickly followed by the disastrous battle of Bull Run, which fairly aroused the North to action. On August 18, General Butler resigned the command of the department of Virginia to General Wool, and accepted a command under him. The first duty entrusted to General Butler was an expedition sent to reduce the forts at Hatteras Inlet, in which with a small force he was successful. Early in September, he was authorized by the war department to raise and equip six regiments of volunteers from New England for the war. This task was easy for the energetic general. Early in the year 1862, the capture of New Orleans was undertaken, and General Butler was placed in command of the department of the Gulf, and fifteen thousand troops entrusted to him. After innumerable delays, the general with a part of his force arrived, March 20, 1862, at Ship Island, near the delta of the Mississippi River, at which rendezvous the rest of the troops had already been assembled. From this post the reduction of New Orleans was executed. On the morning of April 24, the fleet under command of Captain Farragut succeeded in passing the forts, and a week later the transport Mississippi with General Butler and his troops was alongside the levee at New Orleans. On December 16, 1862, General Butler formally surrendered the command of the department of the Gulf to General Banks. What General Butler did at New Orleans during the months he was in command in that city is a matter of history, and has been ably chronicled by James Parton. He there displayed those wonderful qualities of command which made him the most hated, as well as the most respected, Northern man who ever visited the South. He did more to subject the Southern people to the inevitable consequence of the war than a division of a hundred thousand soldiers. He even conquered that dread scourge, yellow fever, and demonstrated that lawlessness even in New Orleans could be suppressed. The new channel for the James River, known as the Dutch Gap, planned by General Butler, and ridiculed by the press, but approved by the officers of the United States Engineer Corps, remains to this day the thoroughfare used by commerce.