What happened to Fethullah Gülen at the time of the 1980 military coup?

In 1980, on September 5, Fethullah Gülen spoke from the pulpit before taking leave of absence for the next twenty days because of illness.

On September 12, the day of the military coup, his home was raided. He was not detained as he was not at home. He requested another leave of absence for forty-five days. Then the house where he was staying as a guest was raided and he was detained. After a six-hour interrogation, he was released.

On November 25, he was transferred to Çanakkale. However, due to illness again, he was not able to serve there. From March 20, 1981, he took indefinite leave of absence.