Detailed Instructions: From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.
Q: Given Relationship: 'invade', Sentence: 'After Communist North Korean forces invaded South Korea on June 25 , 1950 , the war raged up and down the peninsula several times as the United States , the United Nations and finally Communist China sent ground forces there .'
A:
invaded