15. Then comes a reproachful notice of the tribes which did not obey
the summons to take the field against the common enemy of Israel. By the
divisions--that is, the watercourses which descend from the eastern
hills unto the Jordan and Dead Sea.
For the divisions of Reuben there were great thoughts of heart--They
felt the patriotic impulse and determined, at first, to join the ranks
of their western brethren, but resiled from the purpose, preferring
their peaceful shepherd songs to the trumpet sound of war.
JFB.
Picture Study Bible