"Cedar Falls-Junction City: A Turning Point" has been written at the request of General William C. Westmoreland, Chief of Staff of the Army, who, concerned about the lack of authoritative accounts of various actions and activities in Vietnam, desired that a series of monographs be prepared to fill the void in the Army's historical library. Operations Cedar Falls and Junction City took place during the first five months of 1967 and were the first multidivisional operations in Vietnam to be conducted according to a preconceived plan. They were to result in a turning point in the war: they confirmed that such operations do have a place in counterinsurgency warfare today; they brought an end to the enemy's thinking that his third phase of the war-large-scale operations throughout the country-would be successful; they caused the enemy to re-evaluate his tactics and revert to smaller-scale guerrilla operations; they destroyed his camps, pillaged his supplies, and killed hundreds of his best troops; they proved to the enemy that his old sanctuaries were no longer inviolable, thus causing him to depend primarily upon those located over the border in Cambodia; they helped convince the enemy that the maintenance of large bases and main force units near urban areas was risky business; and they enhanced immeasurably the confidence of the allied forces in South Vietnam, a confidence which had been growing since the dark days of the first half of 1965. Thus Cedar Falls and Junction City were to become the most important operations of the war to that time, and perhaps since.