C. F. Keil and Franz Delitzsch on 1 Samuel 11:8

1Sa 11:8

Saul held a muster of the people of war, who had gathered together at (or near) Bezek, a place which was situated, according to the Onom. (s. v. Bezek), about seven hours to the north of Nabulus towards Beisan (see at Jdg 1:4). The number assembled were 300,000 men of Israel, and 30,000 of Judah. These numbers will not appear too large, if we bear in mind that the allusion is not to a regular army, but that Saul had summoned all the people to a general levy. In the distinction drawn between the children of Judah and the children of Israel we may already discern a trace of that separation of Judah from the rest of the tribes, which eventually led to a formal secession on the part of the latter.