In the Bohemian Revolt scenario and at the start of the Main Campaign scenario the Protestants need as much help as possible.
Some of the available help come across options but its important to have in mind some other possible help.
When Moravia became unblocked the Protestant player should send some Bohemian troops to Brunn (in Moravia) to get the Moravian regiments.
In the same way if you send enough troops to Wien region you will have some Austrian Protestants reinforcements.
I have added this info to the Annex Document.