"Red Army" is slang, I believe
It was significant because it ended slavery in the United States after the Civil War; was passed by Abraham Lincoln.
What actions? If you label them I can answer your question.
Answer
There were 2 sides fighting in the Vietnam War. One of them was the American Armed Forces which fought against the Vietcong forces which were supported by the Soviet Union during the cold war between the United States and Soviet Union.
survival of the fittest, in other words the Darwinian evolutionary theory. hope this helps!
