Push And Pull.

A better use of the warrior class is to have them attack the dragons so that they will be preoccupied and won't be able to stop the progression of the armada. This action practically doubled the number of enemies the dragons had to stop.

What's more is that these Warriors are not acting alone. They have been buffed to high heavens with extra power by the positive buff class, who are safe within the war fortresses. So each one of the warriors is a walking volcano of power waiting to erupt among their enemies. 

The dragons saw them and attacked. However, the attacks of the dragons didn't kill them. The warriors are smaller than the fortresses and faster too, so they were able to dodge attacks and get close to the dragons. Close-quarters fighting erupted on the frontlines of the battlefield immediately.