I want to know the answer to the following question:
What did Catholic cantons attempt to set up which caused a civil war in 1839?
All the background I'm provided with is that "After a period of unrest with repeated violent clashes such as the Züriputsch of 1839, civil war (the Sonderbundskrieg) broke out in 1847 when some Catholic cantons tried to set up a separate alliance (the Sonderbund).". Is that enough to answer the question?
Answer: yes