Retired Brig. Gen. Wyburn D. Brown, 81, a World War II field artillery brigade commander who contributed to the development of artillery tactics and techniques used in the war, died of pneumonia April 3 at Veterans Administration Hospital in Battle Creek, Mich.

From 1939 to 1941, while assigned to the Artillery Center at Fort Sill, Okla., Gen. Brown became the principal author of the Army's Field Artillery Firing Manual that established the field artillery gunnery techniques used by U.S. forces in World War II.

Early in the war, he served as commanding general of the 11th Airborne Division and in the operations division of the War Department General Staff. In 1944 he commanded the 33rd Field Artillery Brigade in France. He later served as artillery officer for the European Theater of Operations.

After the war, he became chief of the U.S. Military Mission to Columbia. He was chief of the research division of the Command and General Staff College at Ft. Leavenworth, Kan., when he retired in 1951.

Gen. Brown then moved to Washington and worked as a senior engineer for the Corvey Engineering Co. He and his wife of 60 years, the former Margaret Fawcett, moved to Carlisle in 1971 and later moved to Michigan.

A native of Marion, S.C., Gen. Brown attended The Citadel Military College.He graduated from the U.S. Military Academy in 1919. He served in the Philippines and as a mathematics instructor at West Point before 1939.

Besides his wife and a daughter, Margaret Brown Guest, both of Petoskey, Mich., survivors include four grandchildren and four great-grandchildren.