With the advancement of warfare technology , the Army Corps of Engineers had to expand their knowledge of building bridges and facilities capable of handling heavier artillery .
The two corps united as one and expanded in 1863 in the midst of the American Civil War .
With the advancement of warfare technology , the Army Corps of Engineers had to expand corps ' knowledge of building bridges and facilities capable of handling heavier artillery .
The two corps united as one and expanded in 1863 in the midst of the American Civil War .