 Complete the following phrase:  During the winter and spring, both sides occupied themselves with their favoriteand generally profitlesspractice of sending cavalry on raids. Almost a third of Braggs army consisted of cavalry16,000 effectives versus about 9,000 Union. In a February raid against Fort Donelson the Battle of Dover Confederate Maj. Gen. Joseph Wheeler, commanding two brigades of cavalry, failed to capture the garrison in Dover, Tennessee or disrupt Union shipping on the Cumberland River. In March, Rosecrans sent a detachment to cut Braggs communications, but it was forced to surrender in the Battle of Thompsons Station. Also in March, Confederate Brig. Gen. Nathan Bedford Forrest raided Rosecranss communications at Brentwood, a station on the Nashville  Decatur Railroad, in the Battle of Brentwood. Confederate Brig. Gen. John Hunt Morgan made his famous 