_The Effect_ of this contest can hardly be overestimated. Had the Merrimac triumphed, aided by other iron vessels then preparing by the Confederacy, she might have destroyed the rest of the Union fleet in Hampton Roads, reduced Fortress Monroe, prevented the Peninsular campaign (see below), steamed up the Potomac and terrified the capital, sailed along the coast and broken up the blockade, swept through the shipping at New York, opened the way for foreign supplies, made an egress for cotton, and perhaps secured the acknowledgment of the Confederacy by European nations. On this battle hinged the fate of the war. THE WAR IN THE EAST. THE PENINSULAR CAMPAIGN.-Kichmond was here the objective point. It having been decided to make the advance by way of the Peninsula, the Army of the Potomac was carried in transports down the river from Washington. Landing at Fortress Monroe about one hundred thousand strong (April 4), they marched toward Yorktown. [Footnote: Previous to this (March 10), McClellan made an advance toward Manassas, where the Confederates had remained intrenched since McDowell's defeat. The fortifications, which were evacuated on his approach, were found to be quite insignificant, and to be mounted partly with "Quaker guns," _i. e._, logs shaped and painted to imitate artillery. This incident excited much ridicule through the country.] _Siege of Yorktown_.--At this place, General Magruder, with only about five thousand men, by his masterly skill maintained so bold a front along a line thirteen miles in length, that McClellan was brought to a stop. Heavy guns were ordered from Washington, and a regular siege was begun. As McClellan was ready to open fire, Magruder, having delayed the Union army a month, quietly retired. When the movement was discovered, a vigorous pursuit was commenced. [Footnote: On the evacuation of Yorktown--the Confederate forces being concentrated for the defence of Richmond-Norfolk was abandoned, the Navy Yard burned, and the Merrimac, the pride of the South, blown up. United States troops from Fortress Monroe took possession of the city, and gunboats sailed up James River as far as Fort Darling. Here a plunging fire from the bluff forbade further advance.] [Illustration: MAP OF THE PENINSULA] _Battle of Williamsburg_ (May 5).--The Confederate rearguard, now reinforced from Johnston's army at Richmond, stopped in the forts at _Williamsburg_ to gain time for the baggage train and a fierce battle at once ensued. [Footnote: This was General Joseph E. Johnston, who so unexpectedly brought his men to take part in the battle of Bull Run (p. 220). He was wounded in the battle of Seven Pines, but appeared again in two campaigns against Sherman (pp. 257, 272). General Albert Sidney Johnston was killed in the battle of Shiloh (p. 226).]