Hitler's bunker had become the largest, "a positive fortress" containing "a maze of passages, rooms and halls." Junge wrote, "We had air-raid warnings every day" in the period between the 20 July assassination attempt and Hitler's final departure from the "Wolfsschanze" in November 1944, "but there was never more than a single aircraft circling over the forest, and no bombs were dropped. All the same, Hitler took the danger very seriously, and thought all these reconnaissance flights were in preparation for the big raid he was expecting."