Question: Richard B. Paddock was a captain of which regiment that fought natives on the Texas frontier?

<P0-S0> The 4th Cavalry Regiment is a United States Army cavalry regiment, whose lineage is traced back to the mid-19th century. <P0-S1>  Today, the regiment exists as separate squadrons within the U.S. Army. <P0-S2>  The 1st Squadron of the 4th Cavalry's official nickname is "Quarterhorse", which alludes to its 1/4 Cav designation. <P0-S3>  It was one of the most effective units of the Army against American Indians on the Texas frontier. <P0-S4>  The 3rd Squadron of the 4th Cavalry's official nickname is "Raiders". <P0-S5>  Today, the "1st Squadron, 4th Cavalry", "2nd Squadron, 4th Cavalry", "4th Squadron, 4th Cavalry", and "6th Squadron, 4th Cavalry" are parts of the 1st Infantry Division, while the "3rd Squadron, 4th Cavalry" serves as part of the 25th Infantry Division. <P0-S6>  On 23 September 2009, the "4th Squadron, 4th Cavalry" officially stood up at Fort Riley, Kansas as part of the 1st "Devil" Brigade, 1st Infantry Division. <P0-S7>  On 28 March 2008, the "5th Squadron, 4th Cavalry" officially stood up at Fort Riley, Kansas as part of the 2nd "Dagger" Brigade, 1st Infantry Division. <P0-S8>  The 6th Squadron, 4th Cavalry served as part of the recently inactivated 1st Infantry Division, 3rd "Duke" Brigade, at Fort Knox, Kentucky. <SEP> <P1-S0> Richard B. Russell Dam is a concrete-gravity and embankment dam located on the Savannah River at the border of South Carolina and Georgia, creating Richard B. Russell Lake. <P1-S1>  The dam was built by the U.S. Army Corps of Engineers between 1974 and 1985 for the purposes of flood control, hydroelectricity, recreation, additional stream flow regulation, water supply, and fish and wildlife management. <P1-S2>  The concrete structure of the dam spans 1904 ft and rises 210 ft above the riverbed, housing a hydro-power plant with an installed 600 MW capacity. <P1-S3>  The Richard B. Russell Dam is the final large dam completed by the U.S. Army Corps in the Savannah River Basin and lies 30 miles downstream from the Hartwell Dam (1962) and 37 mi upstream from the J. Strom Thurmond Dam (1954). <SEP> <P2-S0> Fort Lancaster, one in a series of forts erected along the western Texas frontier, is located in the Pecos River Valley, along Live Oak Creek, in Crockett County, Texas, United States. <P2-S1>  The fort was established by Captain Stephen Decatur Carpenter on August 20, 1855, to guard the military supplies, commercial shipments, and immigrants moving along the San Antonio-El Paso Road. <P2-S2>  The 82 acre site, now operated by the Texas Historical Commission as Fort Lancaster State Historic Site, contains the ruins of twenty-nine buildings that made up the fort and a visitor center with a museum about the heritage of the fort. <SEP> <P3-S0>  Paddock served as a lieutenant and captain in the 13th Infantry Regiment, the 4th Cavalry Regiment, and the 6th Cavalry Regiment. <P3-S1> Richard Bolles Paddock (1859–1901) was a United States Army officer, close friend and brother-in-law to John J. Pershing, and one of the few American officers who died while on duty in China during the Boxer Rebellion. <P3-S2>  Paddock served in the American Southwest during the Apache Wars, as well as the Pine Ridge Campaign (1890–91), the Battle of San Juan Hill (1898) in Cuba during the Spanish–American War, and finally the China Relief Expedition (1900–01).