Because he stood like a stonewall in the Battle of Bull Run in front of the union bridge and forced them to retreat to the north.
'Stonewall' was a nickname given to Thomas Stonewall Jackson.
Stonewall Jackson was born on January 21, 1824
Stonewall Jackson was born on January 21, 1824
Stonewall jackson was a tall man. He was about 6'3.
The brigade he commanded before being promoted to corps command was called the Stonewall Brigade, and his infantry later would be called Jackson's Foot Cavalry for their rapid marching.