were massing
Past progressiveconjugation ofmass.There are other translations for this conjugation.

mass

In the valley below, an army of undead and goblins were massing.
En el valle que había debajo, un ejército de no-muertos y de goblins se estaba reuniendo.
The rebels were massing at their secret headquarters.
Los rebeldes se estaban concentrando en su cuartel general secreto.
Other Dictionaries
Explore the meaning of mass in our family of products.
Word of the Day
milkshake