Definition: In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Input: Passage: Born in Hirschberg on the Saale in the Principality of Reuss-Gera, Germany, Mutschmann moved while he was young with his family to Plauen in Saxony. He served an apprenticeship as an embroiderer and from 1896 to 1901 was employed as a master embroiderer, department head and warehouse director in lace and linen factories in Plauen, Herford and Köln. This was followed by military service from 1901-1903, after which he returned to employment in the Plauen Lace Factyory (Plauener Spitzenfabriken). He established his own lace factory, Mutschmann & Eisentraut, in Plauen in October 1907. During World War I, he served on the Western Front until he was severely wounded in April 1916. He was discharged from the Army as unfit for field service on 24 December 1916, then resuming the direction of his factory in Plauen. After the war, he was an early participant in the nationalist and anti-semitic Deutschvölkischer Schutz und Trutzbund. He was a founding member of the local branch (Ortsgruppe) of the National Socialist German Workers Party (NSDAP) in Plauen and made personal donations of capital to the Nazi Party.
 Link Information: During World War I, he served on the Western Front until he was severely wounded in April 1916. Question: How long had World War I been going on for when Mutschmann was wounded on the Western Front?
Output:
Answer: 2