The first real baptism of fire experienced by the 56th was on April 16th, when a large force of the enemy came out and fell on the left of the division near Lee's Mills. The rebels were repulsed, and the officers commended the men of the regiment for their courage and steadiness under fire. May 5th they had more fighting experience after a swift march of the day before to the front of Fort McGruder in the suburbs of Williamsburgh. Here they took part in a charge on their enemies with fixed bayonets, which caused the latter to flee in confusion leaving many dead and wounded and about 600 prisoners. They remained in line of battle all night, standing in deep mud, and drenched by a drizzling rain. When, the next afternoon, they were each given three biscuits of hardtack it was the first food they had eaten in two days, and ended the first experience of intense gnawing hunger with the most of them. May 9th they followed the retreating rebels over roads deep with mud, exchanging shots with them day after day, sleeping on the ground at night, wading streams waist-deep sometimes, with little to eat, and much of the time only what they could jayhawk. May 19th they drove the enemy across the Chickahominy at a point opposite Richmond, and as all the bridges had been destroyed, waded the next day across the Oozy river without much opposition, and waited for the rest of the corps, which followed in three days, and crossed the river on a bridge which had meanwhile been constructed for them. During the next three days the regiment was kept on the move making reconnaissances and scouting, and scouted to within four miles of the city of Richmond. May 28th the 56th found itself assigned with Casey's division to a position on the right of the Williamsburgh turnpike, remained on picket till sometime after the attack of the 31st and captured a number of the enemy's skirmishers. Later, when the two lines of battle were formed, it was placed to support Spratt's battery, but the battery's captain relieved it and left the division lying on the ground exposed to the plunging fire of the enemy's artillery, which killed the men "at a fearful rate." They then formed in the edge of the woods, and there fought two hours, and Colonel Van Wyck was wounded in the leg by a piece of shell. The division that day opposed a force of 30,000, and held the line. Three times the enemy charged to within reach of their bayonets, and each time was driven back. The division made one of the most bloody and obstinate fights of the war, and lost nearly half of its men, but, it was believed, saved the army of the Potomac from great disaster.