Final answer:
The troops that arrived in mid-summer during World War I were a crucial part of the Allies' efforts to turn the tide of the war.
Step-by-step explanation:
The troops that arrived in mid-summer during World War I were a crucial part of the Allies' efforts to turn the tide of the war. In the summer of 1918, a quarter-million US troops arrived each month, bolstering the numbers and strength of the Allied forces. These troops played a significant role in stopping the German advance and ultimately helping to secure victory for the Allies.