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Parliamentary forces in Brecon under the command of Colonel Thomas Horton moved quickly to reinforce the castle , although with only 3,000 men they were content to wait until a larger army under Oliver Cromwell could arrive from Gloucester .
 Brecon, Thomas Horton, Oliver Cromwell, Gloucester
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Brecon, Thomas Horton, Oliver Cromwell, Gloucester