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In 1848 , after the outbreak of the revolution , he went to Vienna and entered the student 's legion which played a prominent role in the disturbances ; he fought against the imperial troops during the siege of the city in October .
 location: Vienna
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 location: Vienna