In This is Music, Book 3 by William R. Sur, the chorus is "O vas, camarada, vas camarada, o vas, o vas, o vas (twice) = Oh, you go, friend, you go, friend, oh you go, oh you go, oh you go". Btw, the lyrics under the staves are miscut, it's ca/ma/ra/da. And there's no such thing as "camarad" in Spanish.
According to this Wiki page the chorus was borrowed from "La chanson de l'oignon" sung by the grenadiers of Napoleon's Imperial Guard.