一斉 いっせい攻撃 こうげきじゃありませんでした
issei kōgekijārimasendeshita

Noun
Desu Copula

The polite, past negative form of 一斉攻撃

1. It wasn't a coordinated attack.; It wasn't a mass attack.

Past/Perfective
Negative
Polite
Terminal Form