Survivors

Tia, squad ones Lieutenant, had been ordered to escort the captured prisoners and surviving civilians to Drom.

In relation to the Infernum headquarters, Drom was half a day closer to the town. This made the obvious choice when escorting civilians, especially when most of them were walking rather than using a horse.

Some of the civilians that managed to escape the fighting had been injured in the process and died during travel, despite Tia's best efforts.

She only had one other Infernai with her and he was a defense type supporter. Tia was capable of creating and controlling ice, a decently versatile ability that could attack or defend if used correctly. 

Her ability to adapt during combat, her skill when using her ability, as well as her raw power, these were the reasons she was chosen as squads one Lieutenant.