 Rowley's brigade was the First Brigade of Maj. Gen. Abner Doubleday's Third Division of the Maj. Gen. John F. Reynolds' I Corps.The 151st Pennsylvania's first engagements were during the Chancellorsville Campaign in late April and early May, 1863 near Fredericksburg, Virginia.The Army of the Potomac, under the command of Maj. Gen. Joseph Hooker, made a series of diversions to mask a bold flanking maneuver around the left flank of Gen. Robert E. Lee's Army of Northern Virginia.