What former President used the military to save the republic and what occurred exactly?
Abraham Lincoln - CIVIL WAR resulted He declared Martial Law which suspended habeas corpus in the US. More specifically he imposed the suspension on “prisoners of war, spies, or aiders and abettors of the enemy,” as well as on other classes of people, such as draft dodgers.” Source=https://en.wikipedia.org/wiki/Martial_law_in_the_United_States#Ex_parte_Milligan
Abraham Lincoln - CIVIL WAR resulted He declared Martial Law which suspended habeas corpus in the US. More specifically he imposed the suspension on “prisoners of war, spies, or aiders and abettors of the enemy,” as well as on other classes of people, such as draft dodgers.” Source=https://en.wikipedia.org/wiki/Martial_law_in_the_United_States#Ex_parte_Milligan
He also smashed printing presses, didn't he?