According to this book:

https://books.google.de/books?id=zVNEAQAAIAAJ&pg=PA48

the official list of losses, put together on 15th November, shows that on the first day of the battle the two battalions in Arcole and the one battalion posted along the river Alpone were:

4. Banater Bataillon
5. Banater Bataillon
4. Banalisten-Bataillon

The author doesn't say which of these battalions was posted along the Alpone.