Grant’s Vicksburg campaign officially began on March 29, 1863, when he ordered McClernand’s Corps to open a road for the army from Milliken’s Bend to the river below the city. Considerable work had been done previously when it was contemplated that a canal from Duckport to the river below Vicksburg might offer passage to the fleet. Falling waters had finally defeated this plan and, during April, McClernand’s engineers labored to bridge streams, corduroy roads, and build flatboats to cross areas still covered by flood waters. During that month also, elements of the Army of the Tennessee accomplished the 70-mile march and assembled at a small hamlet appropriately named, Hard Times, in view of Grant’s unpleasant bayou experiences. Here they were across the river from the Confederate stronghold of Grand Gulf, 25 miles below Vicksburg. [Illustration: _Adm. David Dixon Porter, commanding the Union naval operations on the inland waters._ Courtesy National Archives.] [Illustration: _Porter’s gunboats running the Vicksburg batteries on the night of April 16, 1863._ From a wartime sketch.] [Illustration: _This remarkable wartime photograph, taken by a Confederate Secret Service agent, shows Grierson’s cavalrymen near the end of their 600-mile raid behind the Confederate lines._ From _Photographic History of the Civil War_.] To ferry the Union Army across the Mississippi, it was necessary for Porter’s fleet, in anchorage north of Vicksburg, to run the batteries and rendezvous with Grant below. While naval craft singly and in groups had, on occasion, passed these batteries successfully before, it was still a formidable undertaking for which careful preparation was required. As protection against shellfire, each vessel had its port side, which would face the Vicksburg guns in passage, piled high with bales of cotton, hay, and grain. Coal barges were lashed alongside as an additional defense. Shortly before midnight, April 16, Confederate pickets in skiffs at the bend of the river above Vicksburg saw the muffled fleet bearing down upon them and quickly gave the alarm. Tar barrels along the bank were ignited and buildings in the small village of De Soto across the river were set afire. The blinding light of a great flare helped illuminate the river and outline the fleet for the Confederate gunners. Tier upon tier of the river batteries thundered down on the Union vessels. In return, these boats delivered their broadsides into the city as they passed so close that the clatter of bricks from falling buildings could be heard on board.