Wade Hampton, who was a more mature, and arguably more effective, commander. Another Eastern commander of note was Turner Ashby, the "Black Knight of the Confederacy", who commanded Stonewall Jackson's cavalry forces in the Valley Campaign; he was killed in battle in 1862. In the Western Theater, the most fearless, and ruthless, cavalry commander was Nathan Bedford Forrest, who achieved spectacular results with small forces but was an ineffective subordinate to the army commanders he was supposed to support, resulting in poorly coordinated battles. Much of the same issues could be said of Forrest's counterpart in the Army of Tennessee, John Hunt Morgan. In the Eastern Theater, the Partisan Ranger John Singleton Mosby succeeded in tying down upwards of 40,000 Federal troops defending rail lines and logistical hubs with only 100-150 irregulars. In the Trans-Mississippi Theater, John S. Marmaduke and "Jo" Shelby became prominent. Union cavalry The Union started the war with five Regular mounted regiments: the 1st and 2nd U.S. Dragoons, the 1st Mounted Rifles, and the 1st and 2nd Cavalry. These were renumbered the 1st through 5th U.S. Cavalry regiments, respectively, and a 6th was recruited. The Union was initially reluctant to enlist additional regiments, because of the expense, the understanding that training an effective cavalryman could take as long as two years, and the conventional wisdom that the rough and forested terrain of the United States, being so different from that of Western Europe, would make the deployment of Napoleonic-style cavalry forces ineffective. As the war progressed, the value of cavalry was eventually realized (primarily for non-offensive missions), and numerous state volunteer cavalry regiments were added to the army. While initially reluctant to form a large cavalry force, the Union eventually fielded some 258 mounted regiments and 170 unattached companies, of differing enlistment periods, throughout the war and suffered 10,596 killed and 26,490 wounded during the struggle. The Union cavalry was disadvantaged at the start of the war because Northern soldiers allegedly had less comparative equestrian experience than their Southern counterparts, and the Union army did not institute an examination in basic horsemanship before a recruit was mustered into service until August 1862. In addition, over half (104 out of 176) of the experienced U.S. Army cavalry officers had resigned their commissions to fight for the Confederacy. One advantage the Union horseman had over his opponent was the centralized horse procurement organization of the army, relieving him