Treasury of Scripture
ye blow. A single alarm was a signal for the eastward division to march; two such alarms the signal for the south; and probably three for the west, and four for the North. There appears therefore, a deficiency in the Hebrew Text, 'And when ye blow a third alarm, or signal, the camps on the west shall march; and when ye blow a fourth alarm, the camps on the north shall march.' This addition, however, is not acknowledged by the Samaritan, nor any other version than the Coptic, nor any MS. yet collated. the camps
Numbers 2:10-16 On the south side shall be the standard of the camp of Reuben according to their armies...