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Prelude Colonel Horton marched his 3,000 well disciplined troops , about half of which were dragoons , west to Tenby and laid siege to Tenby Castle which was held by about 500 Royalists under the command of Colonel Rice Powell .
 Horton, Tenby, Tenby, Rice Powell
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Horton, Tenby, Tenby, Rice Powell