the Tribe of Gad: Encamped South of the Tabernacle Under the Standard of Reuben
Source: TTT
Numbers 2:10, 14
On the south side, the divisions of Reuben are to camp under their standard: The leader of the Reubenites is Elizur son of Shedeur, / Next will be the tribe of Gad. The leader of the Gadites is Eliasaph son of Deuel,