It happened, when he had come, that he blew a trumpet in the hill-country of Ephraim; and the children of Israel went down with him from the hill-country, and he before them.
The room in which Ehud met Eglon (Judges 3:20) was on the flat roof of his house. Rooms built this way caught the prevailing currents of air and therefore provided a cool place of retreat from the hot weather.