Force [arms, KJV] of a flood indicates large numbers of people.
The prince of the covenant at that time would have been the high priest
A league is made with him suggests coming into power through treaties.
God is giving us clues that this end-time conspiracy will not require a huge army to be put into effect. All it will take is strategically placed people—people who are in positions to wield a great deal of authority and who will exercise that authority at just the right time and place. Malachi Martin and others have said that John Dewey almost singlehandedly corrupted the American educational system, along with others like B.F. Skinner, Edward Thorndike, and John Watson. All it took was a few people at the right time and in the right places where they could wield influence over others.
Similarly, the end-time conspiracy will be done legally, and its basic systems are already in operation.
John W. Ritenbaugh
What I Believe About Conspiracy Theories