Rabbi Yisachar Shlomo Teichtal HY"D had begun his rabbinical career as a member of an Anti-Zionist Chasidic group.
The Holocaust woke him up and made him aware that his previous outlook on the land of Israel and the redemption was flawed and he came to the conclusion that huge antisemitism such as what was taking place during the Holocaust was part of a Divine Plan (that is to say G-d granting power to the antisemitic gentiles, who of their own free will, hated Jews) to force the Jews back to the land of Israel; because when things are too comfortable in the lands of exile many Jews are not sufficiently motivated to give it all up, to move to Israel.
Currently the whole bookthat has been translated into English can be downloaded as a pdf file for free at
http://www.israel613.com/books/ERETZ_EM_HA_BANIM-ENG.CV.pdf