Perhaps it is not possible to give a brief overview of exactly where Luther intervened in the course of the Czech Reformation. The Reformation itself in Bohemia was very diverse and a more objective dialogue between the Unity of the Brethren and the Utraquist Church took place only in the second half of the 16th century.
The expression of this dialogue is the Czech confession of 1575, which, however, and not only formally, is dependent on the Augsburg confession. Unfortunately, the Counter-Reformation stopped this natural dialogue, which has been promising especially since 1609 (Rudolph's Majesty), when full religious freedom was achieved in the Czech Kingdom and the Unity of Brethren did not have to hide in the new situation.