DiMaggio's 56-game hitting streak during the 1941 season began on May 15, when he singled home a run, and ended on July 17. In between he hit .406, and fans all over the country anxiously checked each game day to see if the Yankee Clipper had kept the streak going. People jammed the ballpark; radio programs were interrupted for "DiMag" bulletins, the U.S. Congress designated a page boy to rush DiMaggio bulletins to the floor, and newspaper switchboards lit up every afternoon with the question of the day, "Did DiMaggio get his hit?" Immediately after Cleveland pitchers Al Smith and Jim Bagby held DiMaggio hitless on July 17, with the help of two great plays at third base by Ken Keltner, he started another hitting streak that ran 17 games. At the same time, twenty-two-year-old Red Sox slugger Ted Williams was setting a modern-age batting average of .406. During that same year, young pitcher Bob Feller won 25 games for the Cleveland Indians, and veteran pitcher Lefty Grove won his 300th game. In 1941, DiMaggio won his second Most Valuable Player award and like the rest of the nation began to feel the pressure of a nation readying itself for war. During the 1942 season, DiMaggio batted .305 and was drafted into the army along with thousands of other young men. During his three years in the army DiMaggio played baseball in the Pacific and across the United States. The 1946 season was a disappointment (he batted .290), but by 1947 he was back in form, hitting .315 to win his third Most Valuable Player award and lead his team to the pennant.

Aided by the media machine of New York City and his own powerful statistics, DiMaggio became a national hero after the war, even though he played for the often-hated Yankees. He was even immortalized in a song called "Joltin' Joe DiMaggio," recorded by the Les Brown Orchestra. In 1948, DiMaggio returned to the height of this form, winning the home run title with 39, the RBI crown with 155, and the batting title with a .320 average. DiMaggio sat out the first two months of the 1949 season with a bone spur in his heel, but as always his return was memorable. Although playing in pain, during his first games for new manager Casey Stengel, DiMaggio belted four homers in three games that broke the back of the league-leading Red Sox and helped the Yankees bring home another pennant. In 1951, with another soon-to-be Yankee superstar, young Mickey Mantle, on the scene, DiMaggio's average slipped to .263 with only 12 homers.