Genesis 14:14

And when Abram heard that his brother was taken captive, he armed his trained servants, born in his own house, three hundred and eighteen, and pursued them unto Dan. By the time Abram received the news, the enemies had gotten a long start on their way to their home country. But he acted with commendable speed and energy, for it was his brother, his near relative, whose life was in danger. He immediately assembled the slaves that had been born in his house and had been trained in the use of arms, and literally poured them forth in pursuit of the Babylonian armies, in proper battle array. There were three hundred and eighteen of these servants, besides the men of Aner, Eshcol, and Mamre, that went with Abram to the extreme northern boundary of Gilead, in Perea, where the city of Dan was afterward situated.