What role did habeas corpus play in civil war?

Lincoln suspended Habeas Corpus in response to riots, local militia actions and the threat that the border slave state of Maryland would secede from the Union leaving the nation's capital Washington D.C., surrounded by hostile territory. Lincoln chose to suspend the writ over a proposal to bombard Baltimore, favored by his General-in-Chief Winfield Scott. Lincoln was also motivated by requests by generals to set up military courts to rein in "Copperheads" or Peace Democrats, and those in the Union who supported the Confederate cause.