1 Samuel 31:7 - Ellicott's Commentary On The Whole Bible

On the other side of the valley. — The words “on the other side of the valley” denote the country opposite to the battle-field in the valley of Jezreel, on which the writer supposes himself to be standing, the land occupied especially by the tribes of Issachar, Zabulon, and Napthali. The expression “on the other side of Jordan,” is the usual phrase for the country east of the River Jordan. It is highly probable that the alarm caused by the great defeat of their king caused many of the dwellers in the smaller cities and villages to the east of Jordan hastily to abandon their houses rather than be exposed to the insolence and demands of the invading army. Still the Philistine army in this direction could not have penetrated very far, as shortly after Gilboa we hear of Abner rallying the friends of the house of Saul round the Prince Ishbosheth, whom he proclaimed king at Mahanaim, a town some twenty miles east of the river. The country to the south of the plain of Jezreel does not appear to have been overrun by the victorious army. The presence of David in that part no doubt insured its immunity from invasion.