Thirteen returned to the Alliance after his negotiation with the Earth Dragons ended.
When he came back, he was welcomed with the sight of the 69th Battalion and the Valkyries, as well as the other High-Ranking Officers of the Allied Armies, looking at him with solemn expressions on their faces.
The reason why they were looking at their Supreme Commander with such faces was due to the fact that if he didn't succeed in convincing the Earth Dragons, they would have to fight another war, and this time, they would be fighting against Rank 9 Sovereigns.
Rank 8 and Rank 9 Monsters were on very different levels. Even if all the Monarchs appeared on the battlefield, and the Ten Thrones accompanied them, their chances of winning were quite low.
The reason for this was that the Monarchs were afraid of dying.
Aside from Lawrence, who had a Rebirth Ability, the other Monarchs wouldn't dare throw their lives in a battle with a very low chance of winning.