Reuben, Gad, and the Half-Tribe of Manasseh shared with their brothers the warfare on the other side of the Jordan River but how did the families survive if all the men were across the Jordan supporting the armies of the other tribes? They sent roughly one third of the men across the river, so two thirds were on the east side to take care of all the families of Reuben, Gad, and the half tribe of Manasseh.