The short version is that the SCOTUS ruled that a governor could deploy the National Guard and declare martial law to quell an insurrection, as long as both sides agreed there was an insurrection. Furthermore, the two sides did not have to be in agreement as to the terms on the insurrection, only that one was occurring.
What was Moyer vs. Peabody? Tell us.
The short version is that the SCOTUS ruled that a governor could deploy the National Guard and declare martial law to quell an insurrection, as long as both sides agreed there was an insurrection. Furthermore, the two sides did not have to be in agreement as to the terms on the insurrection, only that one was occurring.