1 Chronicles 5:18
The sons of Reuben, and the Gadites, and half the tribe of Manasseh, of valiant men, men able to bear buckler and sword, and to shoot with bow, and skilful in war, were four and forty thousand seven hundred and threescore, that went out to the war.
Cross-references
1 Chronicles 12:37 also lists Reuben, Gad, and half-Manasseh's warriors, though with a much larger count, indicating different muster occasions.
Deuteronomy 3:12 records Moses giving the land of Gilead to Reuben and Gad — the same tribes and region as the warriors here.
In Joshua 4:12, the same tribes (Reuben, Gad, half-Manasseh) cross armed for battle, showing their military service pattern from earlier history.
2 Kings 10:33 describes the Transjordan territory of Gad, Reuben, and Manasseh — the same tribes whose warriors are listed here.
Numbers 32:33 records the land grant to these same tribes. Their military strength here connects to their possession of that land.
Numbers 1:3 establishes the census of men able for war. This verse applies that same standard to the Transjordan tribes.