What cavalry leader led a attack at fort Donelson?

The cavalry leader who led the attack at Fort Donelson was Brigadier General Ulysses S. Grant. Although he is primarily known for his overall command of Union forces during the battle, he coordinated the cavalry units as part of the larger assault that ultimately resulted in the fort's surrender in February 1862. Grant's leadership was pivotal in securing a significant early victory for the Union in the Civil War.