Lead:  One hundred and fifty years ago the Republic was facing its greatest crisis. This continuing series examines the American Civil War. It is A House Divided.

Intro.: A Moment in Time with Dan Roberts.

Content: Oddly enough, to protect its internal river network, literally the highway to the national interior, the Confederacy relied on heavily fortified citadels which, as it turned out, could be surrounded, starved out, placed under siege and taken. Time and again, particularly in the Union Spring of 1862, aggressive overland infantry attacks often delivered by river-borne transports and combined with heavily armored river craft took those strong points and peeled opened the Southern heartland like a can opener.