Eim HaBanim Semeicha was written by Rabbi Yisachar Shlomo Teichtal, and published in 1943 in Budapest, Hungary.
The physical product of that introspection is the book, Eim HaBanim Semeicha, in which he specifically retracts his previous viewpoints, and argues that the true redemption can only come if the Jewish people unite and rebuild the land of Israel.
Many of his coreligionists viewed the book with skepticism, some going so far as to ban Rabbi Teichtal from their synagogues.
In the book, Rabbi Teichtal strongly criticizes the Haredim for not supporting the settlement of the Land of Israel.
When it was written, it was a scathing criticism of the Jewish Orthodox establishment, and Agudat Israel in particular.