Which statement accurately describes a WWI triangle division?

• A. It was lighter and more maneuverable, comprising three regiments with about 15,000 men
• B. It was heavier with four regiments
• C. It included a corps of four divisions
• D. It fought with cross-attached elements from other arms

Answer: (A)

A WWI triangle division is an infantry division organized into three regiments instead of the four regiments found in the older square (two-brigade) layout. This structure made the unit lighter and more maneuverable on the battlefield, while its typical strength hovered around 12,000–15,000 men. That directly fits the description of being lighter and more maneuverable with three regiments and about 15,000 men.

A four-regiment setup would be a square division—larger and less flexible. Divisions are standalone units within a corps; a corps contains multiple divisions, not the other way around. Cross-attached elements from other arms could occur in WWI, but that isn’t what defines a triangle division.