On March 10, 1862, Battery E &amp; G, 1st U.S Artillery joined Major General George B. McClellan's Army of the Potomac as it embarked upon the Peninsula Campaign on Virginia's York-James Peninsula. The battery was attached to the Artillery Reserve under Colonel Henry Jackson Hunt. Traveling by sea and landing at Fortress Monroe, Battery E &amp; G joined the Siege of Yorktown, then moved westward with the Army of the Potomac to the Chickahominy River. Following the Battle of Fair Oaks, the battery was stationed by the Woodbury Bridge near McClellan's headquarters at Savage's Station until June 29, 1862. After General Robert E. Lee's Army of Northern Virginia shook McClellan's confidence with a string of heavy blows opening the Seven Days Battles at &lt;a href="Battle%20of%20Beaver%20Dam%20Creek"&gt;Beaver Dam Creek/Mechanicsville&lt;/a&gt; and Gaines' Mill, the Union commander ordered his bloodied V Corps (then north of the Chickahominy) to return south of the river and follow the rest of the Army of the Potomac on a retreat toward the perceived safety of the banks of the James River near Harrison's Landing. This massive redeployment was undertaken from June 29–30, 1862.