Escro 1 functioned as a Lambda-class T-4a shuttle for the Alliance Fleet. This vessel belonged to the Escro group, a participant in the Skirmish at Outpost D-34. Alongside Escro 2 and 3, Escro 1, trailing behind Roe group, tried to prevent Imperial troops from seizing Onece 3 of Onece group, which transported allied rebel personnel. Alas, both shuttle groups failed in their objective, culminating in their complete annihilation.