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The Leach Trench Catapult ( sometimes called a Leach-Gamage Catapult ) was a bomb - throwing catapult used by the British Army on the Western Front during World War I .
 organization: British Army
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:
 organization: British Army