Oldenburg
In 1830 Hirsch was elected chief rabbi (Landesrabbiner) of the principality of Oldenburg. During this period he wrote his Neunzehn Briefe über Judenthum, (Nineteen Letters on Judaism) which were published, under the pseudonym of "Ben Usiel" (or "Uziel"), at Altona in 1836. This work made a profound impression in German Jewish circles because it was something new — a brilliant, intellectual presentation of Orthodox Judaism in classic German, and a fearless, uncompromising defense of all its institutions and ordinances.
In 1838 Hirsch published, as a necessary concomitant of the Letters, his Horeb, oder Versuche über Jissroel's Pflichten in der Zerstreuung, which is a text-book on Judaism for educated Jewish youth. In fact, he wrote Horeb first, but his publishers doubted that a work defending traditional Judaism would find a market in those times, when reform was in vogue.
In 1839 he published Erste Mittheilungen aus Naphtali's Briefwechsel, a polemical essay against the reforms in Judaism proposed by Geiger and the contributors to the latter's Wissenschaftliche Zeitschrift für jüdische Theologie (such as Michael Creizenach); and in 1844 he published Zweite Mittheilungen aus einem Briefwechsel über die Neueste Jüdische Literatur, also polemical in tendency and attacking Holdheim's Die Autonomie der Rabbinen (1843).
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