495
He left Colonel Isaac Ewer in command of a small force to besiege the Royalist garrison of Chepstow Castle which was under the command of Sir Nicholas Kemeys and pressed on to join Horton at Tenby arriving on 15 May .
 person: Isaac Ewer; person: Nicholas Kemeys; person: Horton; location: Tenby
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Isaac Ewer; person: Nicholas Kemeys; person: Horton; location: Tenby