Final answer:
Emperor Haile Selassie appealed to the League of Nations for help when Italy, under Mussolini, invaded Ethiopia in 1935, but the League was unable to provide effective military support.
Step-by-step explanation:
Haile Selassie, the Emperor of Ethiopia, sought help from the League of Nations when Italy invaded Ethiopia in 1935. Under the leadership of Benito Mussolini, Italy utilized air power and poison gas, leading to a swift and brutal conflict. Faced with aggressive Fascist ideologies and military advancements, Haile Selassie's pleas to the League represented a profound moment in the prelude to World War II. Despite his appeal to the international body for assistance, the League of Nations had no army to send and ultimately provided little effective support against the Italian invasion.