What crisis did dwight eisenhower use the eisenhower doctrine to justify a military response to a communist threat?

He used the Eisenhower Doctrine as a response to the Suez Crisis. The pressure of the USSR to leave the area was too great and Eisenhower implied that the USSR is to powerful and has a big influence on the world and that the United States have to stop them from spreading their influence and the communist threat.

River valleys were good places for hunting and fishing.