Here is Luther’s 1525 work on the peasants revolt:
Luther “Against the Robbing and Murdering Hordes of Peasants”
Here’s an older blog post about this treatise which helps explain some of the context. Here is another one (especially helpful given what people blame on Luther with regard to the peasant’s war).
For Luther’s 1523 On Temporal Authority:
Luther “On Secular Authority: To What Extent it Should be Obeyed”