This is the 8956th most frequent Portuguese word.
atacassem
"Atacassem" means "they attacked" or "they were to attack," in the past subjunctive form.
In this sentence, 'atacassem' is used in a conditional past subjunctive form expressing a hypothetical scenario or assumption of the action of attacking taking place under certain conditions.
Seria desastroso se eles atacassem a cidade.
It would be disastrous if they attacked the city.
Here, 'atacassem' is in the past subjunctive form, employed as part of suggesting or advocating for an action to be executed by the subject under discussion.
Eu sugeri que todos atacassem com sincronia.
I suggested that everyone attack in sync.
In this case, 'atacassem' is in a conditional past subjunctive form discussing potential consequences of acting without a prior plan.