The brave Confederate general, Magruder, stationed at Yorktown, was joined by General Johnston with his whole army. They saw, however, that it would be impossible to hold that position against McClellan, and so the Confederates gave up the town and retired toward Richmond. The cavalry under Stuart skillfully guarded the rear of the army and concealed its movements from the Federals. At Williamsburg a stubborn and brilliant battle was fought, in which Johnston’s rear guard repelled the Federals. After the battle, the cavalry and the Stuart Horse Artillery protected the rear of the Confederate army as it withdrew toward Richmond and screened the infantry as it took position along the southern bank of the Chickahominy river. McClellan placed his army on the north bank of the same river, and on May 31 and June 1, he threw a large force across the river and engaged the army of Johnston in the battle of Seven Pines. This battle was only a partial victory for the Confederates, and as the river was bordered by wide marshes and dense woods, neither side could make use of cavalry in the conflict. General Stuart, however, was actively engaged in giving personal assistance to General Longstreet on the field. In his report of the battle, General Longstreet said: “Brigadier J. E. B. Stuart, in the absence of any opportunity to use his cavalry, was of material service by his presence with me on the field.” In this battle of Seven Pines, General Johnston was severely wounded and gave place to General R. E. Lee, who was thus put in command of the army defending Richmond and of all of the other Confederate forces in Virginia. McClellan’s magnificent army, now numbering 115,000 men, stretched from Meadow Bridge on the right to the Williamsburg Road on the left, having in front the marshes of the Chickahominy as natural barriers. By entrenching his army behind positions which he secured from time to time, he advanced until at one point he was only five miles from Richmond and could see the spires of the churches and hear the bells ringing for services. General Lee had a much smaller army with which to repel this large entrenched army and he withdrew to the south side of the Chickahominy. It was very important to him to learn the position and strength of the Union forces, so that he might be able to attack them at the weakest point. In order to gain this information, he resolved to send General Stuart with 1,200 cavalry to make a raid toward the White House on the Pamunkey river, which was the base of supplies for the Federal troops. General Lee wrote to General Stuart, giving definite instructions about this scouting expedition. The letter said: “You are desired to make a scout movement, to the rear of the enemy now posted on the Chickahominy river, with a view of gaining intelligence of his operations, communications, etc., of driving in his foraging parties, and securing such grain and cattle for ourselves as you can make arrangements to have driven in.