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

Context paragraphs:
Richard B. Russell Multiple Resource Area: The Richard B. Russell Dam and Lake are located on the upper portion of the Savannah River drainage and its tributaries in Georgia and South Carolina.  Many reservoirs were constructed in the southeast during the twentieth century, and archaeological investigations were conducted in many of them.  The Richard B. Russell Dam and Lake are named after former U.S. Senator Richard Brevard Russell, Jr. From 1969 to 1985, numerous cultural resource investigations were undertaken in the reservoir also known as the Richard B. Russell Dam and Lake and the Richard B. Russell Multiple Resource Area.  The work in the reservoir documented human occupation from the Paleoindian period all the way through to Historic Period.

Richard B. Russell Dam: 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.  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.  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.  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).

Fort Croghan: Fort Croghan was the third of the first four forts established by the United States government to protect settlers from hostile Indians along the Texas frontier.  From its establishment on March 18, 1849 by Lt. C.H. Taylor (Company A, Second Dragoons) until it was abandoned in 1855, Fort Croghan was home to Company C, 8th Infantry, U.S.A. (mounted) and eventually became the headquarters of the Second Dragoon Regiment.

4th Cavalry Regiment (United States): The 4th Cavalry Regiment is a United States Army cavalry regiment, whose lineage is traced back to the mid-19th century.  It was one of the most effective units of the Army against American Indians on the Texas frontier.  Today, the regiment exists as separate squadrons within the U.S. Army.  The 1st Squadron of the 4th Cavalry's official nickname is "Quarterhorse", which alludes to its 1/4 Cav designation.  The 3rd Squadron of the 4th Cavalry's official nickname is "Raiders".  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.  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.  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.  The 6th Squadron, 4th Cavalry served as part of the recently inactivated 1st Infantry Division, 3rd "Duke" Brigade, at Fort Knox, Kentucky.

Pathan Regiment: The Pathan Regiment was an infantry regiment of Pakistan Army now merged into Frontier Force Regiment.  It was raised after the independence of Pakistan on November 1, 1948 from the strength of 12th Frontier Force Regiment and 13th Frontier Force Rifles.  The establishment of this regiment was intended to appease the locals of the Khyber Pakhtunkhwa, who were partially divided at the time of independence in 1947.  The regimental depot was stationed at Dera Ismail Khan and later relocated to Kohat in 1949.  In 1956, this regiment was merged with others to form the Frontier Force Regiment with its regimental depot at Abbottabad.

Fort Gates: Fort Gates, was a United States Army fort established on October 26, 1849 as Camp Gates by Captain William R. Montgomery and two companies of the Eighth United States Infantry.  The fort was located on the north bank of the Leon River about five miles east of the site of present Gatesville, Texas.  The installation was named for Brevet Major Collinson Reed Gates of New York, a noted officer in the Battle of Palo Alto and the Battle of Resaca de la Palma.  The fort was established to protect settlers on the Texas frontier from Indians.  The fort was garrisoned by companies D, I, F, and H of the Eighth United States Infantry.  In April 1851, 256 enlisted men and forty-five officers were stationed at Fort Gates, the most reported in a single month.

Punjab Irregular Force: The Punjab Irregular Force (PIF) was created in 1851, to protect the NW frontier of British India.  It was termed "Irregular" because it was outside the control of the Regular British East India Company Presidency armies of the 3 Presidencies of Bengal, Bombay or Madras, but was under the control of the British chief magistrate of Punjab, known as the President of the Board of Administration from 1849, then as the Chief Commissioner from 1853.  Its soldiers were not subject to parade ground drill and showed unconcern towards routine orders given to regiments of the line.  They practiced swift tactical movements in small groups, showing special elan and flair.  It comprised the various regiments raised earlier for the same purpose on the orders of General Charles James Napier and Col. Sir Henry Montgomery Lawrence between 1843 and 1849 of the former Frontier Brigade established in 1846 and Transfrontier Brigade established in 1849.  In 1865 the PIF was redesignated Punjab Frontier Force and in 1903 became the Frontier Force.  In 1922 it was split into 2 separate units: the 12th Frontier Force Regiment and the 13th Frontier Force Rifles.  In 1947 both were ceded to the new state of Pakistan, which in 1957 amalgamated them, together with a 3rd unit, the Pathan Regiment which Pakistan had earlier created from elements of both, to form the Frontier Force Regiment.  Within the latter regiment, the first 15 of its 52 battalions can trace their origins back to original British Army regiments, and the regiment still maintains the lineage of its predecessor British regiments.  Members of the PIF traditionally referred to themselves with pride as "Piffers", a tradition very much maintained within the Pakistan Army.

38th United States Colored Infantry Regiment: The 38th United States Colored Infantry Regiment was an African American unit of the Union Army during the American Civil War.  A part of the United States Colored Troops, the regiment saw action in Virginia during the war and later served on the Texas frontier.

Richard B. Paddock: 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.  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).  Paddock served as a lieutenant and captain in the 13th Infantry Regiment, the 4th Cavalry Regiment, and the 6th Cavalry Regiment.

Fort Lancaster: 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.  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.  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.

Supporting paragraphs: Richard B. Paddock 4th Cavalry Regiment (United States)
Answer: 4th Cavalry Regiment