Her ambitious plan proves to be too short sighted.

Well no!, for you see, despite all the hard training and preparations that Edelgard her teammates went through previously, they failed to understand something important, no plan survives first contact with the enemy, and it just so happens that Claude had spied on them, during their training session yesterday, and knew what they were gonna do.

And so, rather than focusing on the Blue Lions, and let the Black Eagles carry out their plan, he simply changed it's strategy to counter them down before they had the time to react.

On the center he sent Hilda to pin down Edelgard while he and Ignatz took shots at her and Hubert, and at the same time, sending Leonie on horseback to bypass them and chase Bernadetta, and the things is, it worked!, The Black Eagles had expected them to play defensively, and seeing them attack head on disrupted their plans.

At the other side of the field, the Blue Lions, who by now where mostly fresh, decided that, rather to risk things attacking the Golden Deer, it was for the best for them to get rid of the Black Eagles first before finishing them latter, and so, Dimitri and co, soon began to attack Ferdinand and Lindhart, putting an end to any chance for the Eagles to win quickly.

Seeing how things were turning out, Edelgard and Byleth tried to order their teammates to do something about it while they thought of a new plan, however, between Lindhardt's Lazyness, Bernadetta's cowardice, Hubert's blind devotion, and Ferdinand's ego, they lacked the initiative of their enemies to improvise in the heat of the battle.

In this context, Edelgard knew that she had to do something new and quickly, for if she were not to, they would end up losing the battle, and that was something she could not afford no matter what.