Done.
The Hapsburgs play Treachery for CPs. 2 Mercs built in Besancon. They walk to Strasburg, then Worms to join the Duke of Alva and his 4 Regulars. That full stack marches to Mainz.
@Tom_Mc, any reaction play? Do you want to attempt to avoid battle in Mainz? Barring that, field battle or retreat into the fort?