the withdrawal of all melko 's spies shortly before the attack on gondolin did indeed bring about a renewal of optimism among the gondothlim , and in turgon not least , so that when the attack came the people were unprepared ; but in the later story the shock of the sudden assault is much greater , for there has never been any reason to suppose that the city is in immediate danger , and idril 's foreboding is peculiar to herself and more mysterious .