What was the agreement for the two tribes to get the land?

Answer From The Annual Reading Schedule - Week 40 Notes For Numbers: They would build cities with walls for their little ones and enclosures for their livestock but the men would go to war with the other children of Yisra'el (Israel) and help them get their inheritance before they go back to dwell in their land east of the Yarden (Jordan) (Numbers 32:16-22).