The two armies had faced off against each other at Fredericksburg during the winter of 1862–1863. The Chancellorsville campaign began when Hooker secretly moved the bulk of his army up the left bank of the Rappahannock River, then crossed it on the morning of April 27, 1863. Union cavalry under Maj. Gen. George Stoneman began a long-distance raid against Lee's supply lines at about the same time. Crossing the Rapidan River via Germanna and Ely's Fords, the Federal infantry concentrated near Chancellorsville on April 30. Combined with the Union force facing Fredericksburg, Hooker planned a double envelopment, attacking Lee from both his front and rear.
The two armies had faced off against each other at Fredericksburg during the winter of 1862–1863. The Chancellorsville campaign began when Hooker secretly moved the bulk of his army up the left bank of the Rappahannock River, then crossed it on the morning of April 27 1863. Union cavalry under Maj Gen. George Stoneman began a long-distance raid against Lee's supply lines at about the same time. Crossing the Rapidan River via Germanna and Ely's Fords the Federal infantry concentrated near Chancellorsville on April 30. Combined with the Union force facing Fredericksburg Hooker planned a double envelopment, attacking Lee from both his front and rear.