Sure, here are some of the greatest upsets in sports history in the first half of the 20th century:

* **1914 Boston Braves win World Series.** The Braves were a last-place team in 1913, but they went on to win the World Series in 1914, defeating the heavily favored Philadelphia Athletics. This is considered one of the biggest upsets in baseball history.
* **Notre Dame defeats Army 13-7 in 1913.** Notre Dame was a small, Catholic school, while Army was a national power. Notre Dame's victory was considered a major upset and helped to put the school on the map.
* **Red Sox defeat Cubs 4-2 in 1918 World Series.** The Red Sox were a heavy underdog against the Cubs, who had won the World Series the year before. However, the Red Sox won the series in six games, clinching the championship on Armistice Day.
* **Harlem Globetrotters defeat New York Renaissance 58-50 in 1928.** The Harlem Globetrotters were a barnstorming team that played exhibition games against other teams. They were not considered a serious basketball team, but they pulled off a major upset by defeating the New York Renaissance, who were considered one of the best teams in the country.
* **Galway defeats Kerry 2-14 to 1-11 in 1923 All-Ireland Senior Football Championship final.** Galway was a small county with a population of just over 200,000 people. Kerry was a much larger county with a population of over 800,000 people. Galway pulled off a major upset by defeating Kerry in the All-Ireland Senior Football Championship final, becoming the first team from Connacht to win the title.

These are just a few of the many great upsets that happened in sports in the first half of the 20th century. These upsets are remembered for their surprise factor and the impact they had on the sports world.
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