Also this I came to see as wisdom under the sun, and it impressed me. There was a small city with few men in it and a great king came to it, surrounded it and constructed large siegeworks against it. But there was found in it a poor wise man and he delivered the city by his wisdom. Yet no one remembered that poor man.
I read of a wise woman who "surrendered a traitor" once.."What besieges the heart can cause it to err"