Since Thirteen didn't lack money at the moment, he decided to buy nearly three hundred Avatars from the Dvalinn Federation using Empyrium as currency.
The majority of the Avatars he bought could be gained in the Rigel Continent, so it hadn't been difficult for the Elrod Clan and the three Prestigious Families to procure them.
He bought everyone, with the exception of the Captains, Rank 4 Night Wolves, which made Alcapone whistle.
The reason why Thirteen chose Night Wolves as mounts for his soldiers was due to two reasons.
First, the Night Wolf was a great mount.
It was fast, and they could climb steep hills and mountains. It was also a good swimmer, making it a very versatile mount.
Second, it was a Hunter.
It could serve as a guard or a fighter for the Green Lanterns while they tended to the injured.