Mordecai 'Three Finger' Brown, left, former Chicago Cubs pitcher; Urban 'Red' Faber, center, former Chicago White Sox spitballer; and Ed Walsh, Big Moose of the White Sox hurling fame before World War I, discuss curve versus spitball at the Diamond Jubilee dinner of the Old Time Baseball Players Association in Chicago, Ill., Feb. 3, 1944. (AP Photo/Paul Cannon)

How many baseball Hall of Famers served in World War I?

On April 6, 100 years ago, the United States officially entered World War I by declaring war on Germany.

April 2 was the opening day for baseball season this year.

How many National Baseball Hall of Famers served in the armed forces during World War I?

There are 27.

According to the Hall of Fame, one player served during the Civil War, 36 during World War II and six in the Korean War.

The only two Hall of Famers known to have served in two wars are Larry MacPhail who served in World War I and World War II and Ted Williams who served in World War II and the Korean War.

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Grover Cleveland Alexander, right-handed pitcher for the St. Louis Cardinals, is shown in action on Sept. 9, 1926 at an unknown location. (AP Photo)

Grover Cleveland Alexander

Alexander served in the Army.

He was a pitcher who played for the Philadelphia Phillies, Chicago Cubs and St. Louis Cardinals

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Elmer Layden, left, NFL commissioner, and A.B. 'Happy' Chandler, baseball commissioner, meet in Washington, D.C., Aug. 22, 1945, to confer on mutual problems. Among these is the use of baseball parks for professional football games. (AP Photo/John Rous)

Albert "Happy" Chandler

Chandler served in the Army. He was the second commissioner of Major League Baseball.

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Oscar Charleston, a longtime player and manager in baseball's black leagues, was elected to the Baseball Hall of Fame on February 10, 1976. This is an undated photo.(AP Photo)

Oscar Charleston

Charleston served in the Army. He was a center fielder and manager in the Negro League, for the Chicago American Giants, ABCs, Lincoln Stars, St. Louis Giants, Harrisburg Giants, Philadelphia Hilldales, Homestead Grays and Pittsburgh Crawfords.

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Wearing the uniforms of the teams they represented in their heyday, Tris Speaker, left, of the Cleveland Indians, Babe Ruth, center, of the New York Yankees and Ty Cobb of the Detroit Tigers, acted as managers and coaches for a day at the 32nd Annual Amatuer Day of the Cleveland Baseball Association sandlot group in Cleveland, Ohio, July 27, 1941. (AP Photo/DW)

Tyrus "Ty" Cobb

Ty Cobb served in the Army. He was an outfielder with the Detroit Tigers and Philadelphia Athletics.

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Eddie Collins, manager and second baseman of the Chicago White Sox, shown on July 23, 1926. (AP Photo)

Eddie Collins

Edward "Eddie" "Cocky" Collins served in the Marines. He played second base for the Philadelphia Athletics and Chicago White Sox; was a coach and then manager of the Boston Red Sox.

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Brooklyn Dodgers' coach Leo Durocher kicks some dirt at veteran umpire Jocko Conlan in Los Angeles in a fourth inning beef during the Dodgers-Pirates game, April 16, 1961. Catcher Hal Smith looks on. Durocher was thrown out of the game. (AP Photo/David F. Smith)

Jocko Conlan

Jocko Conlan served in the Navy. He was an umpire for the National League and played briefly as an outfielder with the Chicago White Sox.

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Urban "Red" Faber

Urban "Red" Faber served in the Navy. He was a pitcher for the Chicago White Sox.

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Babe Ruth and a group of Cincinnati Reds chat about their favorite sport during a visit by the Babe to the team's spring training camp in Tampa, Fla., March 16, 1948. From left to right: pitcher Johnny Vander Meer; club president Warren Giles; Ruth; manager John Neun, and first baseman Norman 'Babe' Young. (AP Photo/PF)

Warren Giles

Warren Giles served in the Army. He was club president and general manager of the Cincinnati Reds and president of the National League.

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Burleigh Grimes shown Sept. 17, 1931. (AP Photo)

Burleigh Grimes

Burleigh Grimes served in the Navy. He was a pitcher for the Pittsburgh Pirates, Brooklyn Robins, New York Giants, Boston Braves, St. Louis Cardinals, Chicago Cubs and New York Yankees, and manager of the Brooklyn Dodgers.

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Harry Heilmann, the Detroit Tiger outfielder who hit .403 in 1923, is shown in a photo circa 1926. (AP Photo)

Harry "Slug" Heilmann

Harry Heilmann served in the Navy. He was a right fielder and first baseman for the Detroit Tigers and Cincinnati Reds and was play-by-play announcer for the Tigers.

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Waite Hoyt, one time Yankee hurler, as he appeared in a Pirate uniform after reporting at the Pittsburgh club's training camp in Paso Robles, Calif., on March 13, 1933. (AP Photo)

Waite Hoyt

Waite Hoyt served in the Army. He was a pitcher for the New York Giants, Boston Red Sox, New York Yankees, Detroit Tigers, Philadelphia Athletics, Brooklyn Dodgers and Pittsburgh Pirates.

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George 'Highpockets' Kelly, New York Giants first baseman, at bat, 1922. (AP Photo)

George Kelly

George Kelly served in the Army. He was a first baseman for the New York Giants, Pittsburgh Pirates, Cincinnati Reds, Chicago Cubs and the Brooklyn Dodgers.

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New York Yankees Joe DiMaggio, left and Larry MacPhail pose together in New York, Sept. 16, 1945. (AP Photo/John Lindsay)

Larry MacPhail

Larry MacPhail served in the Army. He was an executive with the Brooklyn Dodgers, New York Yankees and Cincinnati Reds.

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Rabbit Maranville, Chicago Cubs manager is seen in 1925 at the Polo Grounds in New York City. (AP Photo)

Walter "Rabbit" Maranville

Walter "Rabbit" Maranville served in the Navy. He played shortstop and second base for the Boston Braves, Pittsburgh Pirates, Chicago Cubs, Brooklyn Robins and St. Louis Cardinals; and was manager of the Chicago Cubs.

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Richard 'Rube' Marquard is shown at Polo Grounds in New York in 1923. (AP Photo)

Richard "Rube" Marquard

Richard "Rube" Marquard served in the Navy. He was a pitcher for the New York Giants, Brooklyn Robins, Cincinnati Reds and Boston Braves.

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A posed action photo, circa 1910, of New York Giants' star pitcher, Christy Mathewson, who won 373 games during his illustrious career which spanned 17 years, from 1900 to 1916. (AP Photo)

Christopher "Christy" Mathewson

Christopher "Christy" Mathewson served in the Army. He was a pitcher for the New York Giants and Cincinnati Reds and manager of the Reds.

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Herb Pennock, formerly with the New York Yankees, shown in a Boston Red Sox uniform after joining the Sox at its Sarasota, Fla., spring training camp, March 8, 1934. (AP Photo)

Herbert Pennock

Herbert Pennock served in the Navy. He was a pitcher for the Philadelphia Athletics, Boston Red Sox, New York Yankees and Boston Red Sox.

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Sam Rice, outfielder for the Washington Senators, Sept. 25, 1933, location unknown. (AP Photo)

Edgar "Sam" Rice

Edgar "Sam" Rice served in the Army. He was a pitcher and played right field for the Washington Senators and the Cleveland Indians.

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Paul Dean, right, former St. Louis Cardinals pitcher, was in St. Louis June 1, 1938, for a conference with general manager Branch Rickey, left, after Paul failed to hurl effectively for Houston, the Cards' Texas League farm team. (AP Photo)

Wesley Branch Rickey

Wesley Branch Rickey served in the Army. He was a catcher with the St. Louis Browns and New York Highlanders; manager, St. Louis Browns, St. Louis Cardinals; general manager, St. Louis Browns, St. Louis Cardinals, Brooklyn Dodgers, Pittsburgh Pirates. Rickey was the first to break the color barrier when he signed Jackie Robinson.

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Eppa Rixey, southpaw pitcher of the Cincinnati Reds, poses before a game, Sept. 9, 1926. (AP Photo)

Eppa Rixey Jr.

Eppa Rixey served in the Army. He was a pitcher for the Philadelphia Phillies and Cincinnati Reds.

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Charles "Bullet" Rogan

Charles "Bullet" Rogan served in the Army. He was a pitcher for the 25th Infantry Wreckers, All Nations Club and Kansas City Monarchs. He also served as manager of the Monarchs.

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Louis Santop

Louis Santop served in the Navy. He was a catcher for the Oklahoma Monarchs, Philadelphia Giants, New York Lincoln Giants, New York Lincoln Stars, Brooklyn Royal Giants and Hilldale Club.

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Joe Sewell, infielder of the New York Yankees, is shown here in this September 16, 1932 photo. (AP Photo)

Joseph Sewell

Joe Sewell served in the Army. He was an infielder for the Cleveland Indians and the New York Yankees.

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St. Louis Browns' George Sisler strikes a batting pose in this September 1920 file photo, the year he batted .420. (AP Photo/File)

George Sisler

George "Gorgeous George" Sisler served in the Army. He was a pitcher and first baseman for the St. Louis Browns, Washington Senators and Boston Braves, and manager of the St. Louis Browns.

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Boston Red Sox outfielders, from left, Duffy Lewis, Tris Speaker and Harry Hooper are shown in 1919. (AP Photo)

Tris Speaker

Tristram "Tris" Speaker served in the Navy. He was a center fielder for the Boston Americans/Red Sox, Cleveland Indians, Washington Senators and Philadelphia Athletics; and manager, Cleveland Indians.

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A 1934 posed batting photo of Casey Stengel, first-year manager for the Brooklyn Dodgers. The Dodgers finished in sixth place that season. (AP Photo)

Casey Stengel

Charles "Casey" "The Old Perfessor" Stengel served in the Navy. He was a right fielder for the Brooklyn Dodgers, Pittsburgh Pirates, Philadelphia Phillies, New York Giants and Boston Braves; and manager of the Brooklyn Dodgers, Boston Braves, New York Yankees and New York Mets.

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Jud Wilson

Ernest Judson Wilson served in the Army. He was a third baseman, first baseman and manager for the Baltimore Black Sox, Homestead Grays, Pittsburgh Crawfords and Philadelphia Stars.

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The front page of The Evening News on April 6, 1917.

Pennsylvania played a key role in World War I

To see a gallery of pages from The Evening News on the day the United States entered World War I click here - A century ago, Pennsylvania played a key role in World War I: John Micek.