Question: In what year did the battle that James Ronald Warren fight in begin?

Context articles: James Ronald Warren
Ronald W. Walker
Moymoy Palaboy
Murder in the Family
Jim Grant (baseball)
Battle of the Bulge
Jim Garcia
James Patrick (shipowner)
James Macdonald (engineer)
The Suspect (1944 film)

James Ronald Warren (May 25, 1925 – September 13, 2012) was a Seattle historian instrumental in rediscovering the source of the Seattle fire of 1889.
 He also fought as a member of the 242nd Infantry Regiment of the 42nd Infantry "Rainbow" Division at the Battle of the Bulge and was a German POW.
Ronald Warren Walker (1939 – May 9, 2016) is a historian of the Latter Day Saint movement who was formerly a professor at Brigham Young University (BYU) and president of the Mormon History Association.
Moymoy Palaboy is a Filipino comic and singing duo known for their uploaded lip sync videos in YouTube.
 The duo consists of the Macasero brothers, James Ronald (a.k.a. Moymoy, born on July 17, 1983, in Pasay City) and Rodfil (a.k.a. Roadfill, born on August 28, 1985, in Pasay City).
 They are now GMA Network contract artists.
Murder in the Family is a 1938 British crime film directed by Albert Parker and starring Barry Jones, Jessica Tandy and Evelyn Ankers.
 It was adapted from a novel by James Ronald.
 The screenplay concerns the murder of a wealthy woman.
James Ronald Grant (August 4, 1894 – November 30, 1985) was a pitcher in Major League Baseball who played briefly for the Philadelphia Phillies during the 1923 season.
 Listed at 5 ft , 180 lb., Grant batted right-handed and threw left-handed.
 He was born in Coalville, Iowa.
The Battle of the Bulge (16 December 1944 – 25 January 1945) was the last major German offensive campaign on the Western Front during World War II.
 It was launched through the densely forested Ardennes region of Wallonia in eastern Belgium, northeast France, and Luxembourg, towards the end of World War II.
 The surprise attack caught the Allied forces completely off guard.
 American forces bore the brunt of the attack and incurred their highest casualties of any operation during the war.
 The battle also severely depleted Germany's armored forces, and they were largely unable to replace them.
 German personnel and, later, Luftwaffe aircraft (in the concluding stages of the engagement) also sustained heavy losses.
James Ronald Garcia is a former professional American football player who played defensive lineman for four seasons for the Cleveland Browns, New York Giants, New Orleans Saints, and Atlanta Falcons.
Capt. James Ronald Patrick (1880 – 8 May 1945) was an Australian shipowner, born in Bothwell, Scotland; founder and governing director of James Patrick & Co.
 Pty. Ltd. and the Patrick Line of cargo ships.
Sir James Ronald Leslie Macdonald, KCSI, KCIE, CB (8 February 1862 – 27 June 1927) was a Scottish engineer, explorer and cartographer.
 He served as a British Army engineer, rose to the rank of Brigadier-General and was knighted.
 A balloon observer as a young man, he surveyed for railways in India and East Africa, explored the upper Nile region, commanded balloon sections during wars in South Africa and China and led a major expedition into Tibet in 1903–1904.
The Suspect is a 1944 film noir directed by Robert Siodmak, set in London in 1902, in Edwardian times.
 It is based on the novel "This Way Out", by James Ronald, and was released by Universal Pictures.
 It stars Charles Laughton and Ella Raines.