The term "Allied campaigns" refers to military operations conducted by the Allied Powers during major conflicts, particularly in World War I and World War II. These campaigns involved coordinated efforts among various nations, including the United States, United Kingdom, Soviet Union, and France, aimed at defeating the Central Powers in WWI and the Axis Powers in WWII. Key campaigns included the D-Day invasion in 1944, which marked a significant turning point in WWII, and the Battle of the Somme in 1916, one of the largest battles of WWI. These operations were crucial in shaping the outcome of the wars and establishing post-war peace.