Johnston resolved to strike the detached left wing of the National army, which had crossed the Chickahominy, and advanced to a point within half a dozen miles of Richmond, and his purpose was seconded by a heavy rain on the night of May 30th, which swelled the stream and swept away some of the bridges, thus hindering reinforcement from the other wing. The attack, May 31st, fell first upon Gen. Silas Casey's division of Keyes's corps, which occupied some half-finished works. It was bravely made and bravely resisted, and the Confederate suffered heavy losses before these works, where they had almost surprised the men with the shovels in their hands. But after a time a Confederate force made a detour and gained a position in the rear of the redoubts, when of course they could no longer be held. Reinforcements were very slow in coming up, and Keyes's men had a long, hard struggle to hold their line at all. They could not have done so if a part of Johnston's plan had not miscarried. He intended to bring in a heavy flanking force between them and the river, but was delayed several hours in getting it in motion. Meanwhile McClellan ordered Sumner to cross the river and join in the battle. Sumner had anticipated such an order as soon as he {145} heard the firing, and when the order came it found him with his corps in line, drawn out from camp, and ready to cross instantly. He was the oldest officer there (sixty-six), and the most energetic. There was but one bridge that could be used, many of the supports of this were gone, the approaches were under water, and it was almost a wreck. But he unhesitatingly pushed on his column. The frail structure was steadied by the weight of the men; and though it swayed and undulated with their movement and the rush of water, they all crossed in safety. [Illustration: NORTH BATTERY OF CONFEDERATES AT SHIPPING POINT, POTOMAC RIVER.] [Illustration: MAJOR-GENERAL E. W. GANTT, C. S. A.] [Illustration: MAJOR-GENERAL R. E. RODES, C. S. A.] {146} [Illustration: REVIEW IN WASHINGTON, UNDER McCLELLAN, OF EIGHT BATTERIES OF ARTILLERY AND THREE REGIMENTS OF CAVALRY, BY LINCOLN AND HIS CABINET.]