estaban derrotando
-they/you were defeating
Imperfect progressiveellos/ellas/ustedesconjugation ofderrotar.

derrotar

Los pesimistas alegarán que Francia y Alemania optaron por la diplomacia en febrero de 2015 porque los rebeldes de Ucrania del Este o Nueva Rusia, como ellos mismos la denominan, estaban derrotando al Ejército de Kiev.
Pessimists may argue that France and Germany opted for diplomacy in February 2015, because the rebels in East Ukraine or Novorossiya, as they call it, were beating Kiev's forces.
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pheasant