English Translation
We were attacked by zombies.
I had expected siamo stati attaccati.
We were attacked by zombies.
I had expected siamo stati attaccati.
Passive voice I think.
Gli zombie ci attaccavano. vs. Noi eravamo attaccati dagli zombie.
But still, the imperfect is a descriptive tense. I had expected passato prossimo or remoto, regardless of voice.
Maybe they were habitually and regularly attacked by zombies???
Gotta love your humor!