252788
On 4 September 1780 he was in command of Unicorn when he had the misfortune of encountering , in a fog off Tortuga , a French frigate and two ships of the line that captured him .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None