Wood, he formed the First U.S. Volunteer Cavalry Regiment. His wife and many of his friends begged Roosevelt to remain in his post in Washington, but Roosevelt was determined to see battle. When the newspapers reported the formation of the new regiment, Roosevelt and Wood were flooded with applications from all over the country. Referred to by the press as the "Rough Riders", the regiment was one of many temporary units active only for the duration of the war. The regiment trained for several weeks in San Antonio, Texas, and in his autobiography, Roosevelt wrote that his prior experience with the New York National Guard had been invaluable, in that it enabled him to immediately begin teaching his men basic soldiering skills. The Rough Riders used some standard issue gear and some of their own design, purchased with gift money. Diversity characterized the regiment, which included Ivy Leaguers, professional and amateur athletes, upscale gentlemen, cowboys, frontiersmen, Native Americans, hunters, miners, prospectors, former soldiers, tradesmen, and sheriffs. The Rough Riders were part of the cavalry division commanded by former Confederate general Joseph Wheeler, which itself was one of three divisions in the V Corps under Lieutenant General William Rufus Shafter. Roosevelt and his men landed in Daiquirí, Cuba, on June 23, 1898, and marched to Siboney. Wheeler sent parts of the 1st and 10th Regular Cavalry on the lower road northwest and sent the "Rough Riders" on the parallel road running along a ridge up from the beach. To throw off his infantry rival, Wheeler left one regiment of his Cavalry Division, the 9th, at Siboney so that he could claim that his move north was only a limited reconnaissance if things went wrong. Roosevelt was promoted to colonel and took command of the regiment when Wood was put in command of the brigade. The Rough Riders had a short, minor skirmish known as the Battle of Las Guasimas; they fought their way through Spanish resistance and, together with the Regulars, forced the Spaniards to abandon their positions. Under Roosevelt's leadership, the Rough Riders became famous for the charge up Kettle Hill on July 1, 1898, while supporting the regulars. Roosevelt had the only horse, and rode back and forth between rifle pits at the forefront of the advance up Kettle Hill, an advance that he urged despite the absence of any orders from superiors. He was forced to walk up