いざ鎌倉 かまくらではありませんでした
iza kamakuradewārimasendeshita

Noun
Desu Copula

The polite, past negative form of いざ鎌倉

1. It wasn't as if [something] would happen easily.; It wasn't a situation where [something] would happen.; It wasn't a foregone conclusion.

Past/Perfective
Negative
Polite
Formal Register