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Erskine joined his father ’s regiment the 7th Dragoons in 1742 and served in the War of the Austrian Succession , seeing action at the Battle of Fontenoy , then in the 7 Years War .
 Dragoons
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dragoons