白刃 はくじん一閃 いっせんではありませんでした
hakujin'issendewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 白刃一閃

1. Was not a single flash of white blade.; Was not a quick, decisive strike.

Past/Perfective
Negative
Polite
Formal Register