Who is idea was it to dig trenches on the siege of Petersburg?

The idea to dig trenches during the Siege of Petersburg was primarily implemented by Union General Ulysses S. Grant. Recognizing the strategic importance of the railroad center and the need for a prolonged campaign, Grant ordered his troops to construct extensive trench systems to protect against Confederate attacks and to facilitate a siege strategy. The trench warfare tactics eventually mirrored those used in World War I, illustrating the evolving nature of military strategy during the Civil War.