Lessons from the 19th Century Kulturkampf
There is much to be learned for today's "Culture War" in this article: All Borrowed Armor Chokes Us.

The article ends with these words from Louis Veuillot warning Catholics to be wary of political alliances both Left and Right:

The right tactic for us is to be visibly and always what we are, nothing more, nothing less. We defend a citadel which cannot be taken except when the garrison itself brings in the enemy. Combatting with our own arms, we only receive minor wounds. All borrowed armor troubles us and often chokes us.