The alliance army consisted mainly of three countries.
One was the AvLee elves. They had the largest number, and the main battle force was about 250,000. Perhaps because the news of the death of the ranger Gelu made the elves feel great sorrow. Furthermore, the Sword of Frost had been taken away, and they had to find a way to take back this important artifact, so the elves could be said to have made a big move.