Why was Jean-Paul Sartre captured by the Nazis?

Was it because of his previous writings and the fact that the Nazis didn't like what was portrayed in them, or was it simply due to the fact that he was in the French army and they didn't really care about his writings.|||satre was a very outspoken opponent of any fasictic dictatorship. He wrote a lot against the Nazis and for some years was member of a resistance movement. The nazis knew who he was and what he had wirtten, this along with the fact that he fought made him an enemy.