一斉 いっせい攻撃 こうげきではありませんでした
issei kōgekidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 一斉攻撃

1. It was not a simultaneous attack.; It wasn't a coordinated attack.

Past/Perfective
Negative
Polite
Formal Register