First placing Emory in command of the defences of New Orleans, and ordering Sherman to take Dow and Nickerson and join Augur before Port Hudson, Banks left the city on the 20th of May, rejoined his headquarters on the 21st, and at once set his troops in motion toward Bayou Sara. At half-past eight o'clock on the morning of the 21st of May, Paine broke up his bivouac on the Atchafalaya and marched to Morganza, after detaching the 131st New York and the 173d New York with a section of artillery to guard the ammunition train. Grover followed by water as fast as the steamboats could be provided. At two o'clock on the morning of the 22d of May, Banks and Grover, with the advance of Grover's division, landed at Bayou Sara without meeting any opposition from the enemy, who, up to this time, seems not to have suspected the movement. The other troops followed as rapidly as the means of transport permitted. Grover's division was sent ashore, followed by two brigades of Paine's division from Morganza. The wagon train went on down the road to the landing directly opposite Bayou Sara, under the escort of the 110th New York, and the 162d New York, with one section of Carruth's battery, all under the command of Benedict.
Soon after the landing at Bayou Sara, a party of cavalry rode in, bringing the news of Augur's battle of the 21st. Hearing that Augur was at that moment engaged with the enemy, Banks pressed forward his troops. In a violent storm of wind and rain Grover pushed on until he met Augur's outlying detachments. Then, finding all quiet, he went into bivouac near Thompson's Creek, north-west of Port Hudson. Paine followed, and rested on the Perkins plantation, a mile in the rear of Grover. Banks made his headquarters with Grover. Augur covered the front of the position taken up by the enemy after the battle of Plains Store. On the same day, the 22d, Sherman came up the river, landed at Springfield, and went into position on the Bayou Sara road on Augur's left. Thus at night on the 22d the garrison of Port Hudson was practically hemmed in.
On the 18th, Banks had ordered Augur to march with his whole disposable force to the rear of Port Hudson to prevent the escape of the garrison. As early as the 13th of May, while yet the plan of campaign was in suspense, Augur had sent Grierson with the cavalry and Dudley with his brigade to Merritt's plantation, near the junction of the Springfield Landing and Bayou Sara roads, to threaten the enemy and discover his movements. Dudley then took post near White's Bayou, a branch of the Comite, and remained in observation, covering the road to Clinton and the fork that leads to Jackson. On the 20th of May Augur moved the remainder of his force up to Dudley, in order to be ready to cover T. W. Sherman's landing at Springfield, as well as to meet the advance of the main column under Banks from Bayou Sara, now likely to occur at any moment. With Augur now were Dudley, Chapin, Grierson, Godfrey's squadron composed of troops C and E of the Louisiana cavalry, two sections of Rawles's battery, Holcomb's battery, and one section of Mack's commanded by Sergeant A. W. McCollin. At six o'clock on the morning of the 21st of May Augur marched toward the crossing of the Plains Store and Bayou Sara roads to seize the enemy's line of retreat and to open the way for Banks. When Grierson came to the edge of the wood that forms the southern boundary of the plain, his advance fell in with a detachment of the garrison under Colonel S. P. Powers of the 14th Arkansas regiment, and a brisk skirmish followed. The same afternoon Gardner sent out Miles, with his battalion, about 400 strong, and Boone's battery, to feel Augur's advance and perhaps to drive it away. This brought on the action known as the battle of Plains Store. Unfortunately, no complete reports of the affair were made and the regimental narratives are meagre.
In the heavy forest that then masked the crossroads and formed the western border of the plain, Miles met Augur moving into position; Dudley, on the right of the road that leads from Plains Store to Port Hudson, supporting Holcomb's guns, and Chapin on the left supporting Rawles's guns. For about an hour the artillery fire was brisk. The 48th Massachusetts, being badly posted in column on either side of the Port Hudson road, gave way in some confusion under the sharp attack of Miles's men coming on through the thicket, and thus exposed the guns of Beck's section of Rails. As the 48th fell back through the advancing ranks of the 49th Massachusetts, the progress of that regiment was momentarily hindered, but a brisk charge of the 116th New York restored the battle. On the right, a section of Boone's battery got an enfilade fire on Rails and Chapin, and enabled Miles to draw off and retire behind the breastworks. Thus the affair was really ended before Augur, whose duty it was to act with prudence, had time to complete the proper development of his division as for a battle with the full force of the enemy, which he was bound to suppose was about to engage him. Then he completed the task of making good his position, and proceeded to open communication with Banks and with Sherman.
The main loss fell upon Chapin, Dudley's casualties numbering but 18, Grierson's but 2. The total casualties were 15 men killed, 3 officers and 69 men wounded, and 25 men missing—in all, 102. Miles reports his loss as 8 killed, 23 wounded, and 58 missing,—in all, 89.
When Augur quitted Baton Rouge he placed Drew with the 4th Louisiana
Native Guards in Fort Williams to hold the place, supported by the
fleet, and ordered Nelson with the 1st and 3d Louisiana Native
Guards to be ready to follow the division to Port Hudson.
CHAPTER XVI. THE TWENTY-SEVENTH OF MAY.
Port Hudson was now held by Gardner with a force of about seven thousand of all arms. During the interval that had elapsed since its first occupation a formidable series of earthworks had been thrown up, commanding not only the river but all the inland approaches that were deemed practicable. The first plan for land defence was mainly against the attack expected to come from the direction of Baton Rouge. Accordingly, about four miles below Port Hudson a system of works was begun that, if completed, according to the original trace, would have involved a defensive line eight miles in length, requiring thirty-five thousand men and seventy guns to hold it. As actually constructed, the lines were four and a half miles long, and ran in a semicircular sweep from the river near Ross Landing, below Port Hudson, to the impassable swamp above. Following this line for thirteen hundred yards after leaving the river on the south, the bluff is broken into irregular ridges and deep ravines, with narrow plateaus; thence for two thousand yards the lines crossed the broad cotton fields of Gibbons's and of Slaughter's plantations; beyond these for four hundred yards they were carried over difficult gullies; beyond these again for fourteen hundred yards their course lay through fields and over hilly ground to the ravine at the bottom of which runs Sandy Creek. Here, on the day of the investment, the line of Confederate earthworks stopped, the country lying toward the northeast being considered so difficult that no attack was looked for in that quarter. Sandy Creek finds its way into the marshy bottom of Foster's Creek, and from Sandy Creek, where the earthworks ended, to the river at the mouth of Foster's Creek, is about twenty-five hundred yards. Save where the axe had been busy, nearly the whole country was covered with a heavy growth of magnolia trees of great size and beauty. This was a line that, for its complete defence against a regular siege, conducted according to the strict principles of military science, as laid down in the books, should have had a force of fifteen thousand men. At the end of March the garrison consisted of 1,366 officers, 14,921 men of all arms present for duty, making a total of 16,287. The main body was organized in 5 brigades, commanded by Beall, Buford, Gregg, Maxey, and Rust. The fortifications on the river front mounted 22 heavy guns, from 10-inch columbiads down to 24-pounder siege guns, manned by 3 battalions of heavy artillerists, while 13 light batteries, probably numbering 78 pieces, were available for the defence of all the lines: of these batteries only 5 were now left, with 30 guns.
When, early in May, Pemberton began to feel the weight of Grant's pressure, he called on Gardner for reinforcements; thus Rust and Buford marched to the relief of Vicksburg on the 4th of May, Gregg followed on the 5th, and Maxey on the 8th. Miles was to have followed Maxey; in fact the preparations and orders had been given for the evacuation of Port Hudson; but now the same uncertainty and vacillation on the part of the Confederate chiefs that were to seal the doom of Vicksburg began to be felt at Port Hudson. Gardner, who had moved out with Maxey, had hardly arrived at Clinton when he was met by an order from Pemberton to return to Port Hudson with a few thousand men and to hold the place to the last. But ten days later, on the 19th of May, Johnston, who was then engaged in carrying out his own ideas, which differed radically from those of Davis and Pemberton, ordered Gardner to evacuate Port Hudson and to march on Jackson, Mississippi. This order, sent by courier as well as by telegraph, Gardner received just as Augur was marching from Baton Rouge to cut him off. Then it was too late, and when on the 23d Johnston peremptorily renewed his order for the evacuation, even the communication was closed.
The investment was made perfect by the presence in the river, above and below Port Hudson, of the ships and gunboats of the navy. Just above the place and at anchor around the bend lay the Hartford, now Commodore Palmer's flagship, with the Albatross, Sachem, Estrella, and Arizona. Below, at anchor off Prophet's Island, were the Monongahela, bearing Farragut's flag, the Richmond, Genesee, Essex, and the mortar flotilla. Both the upper and the lower fleets watched the river at night by means of picket-boats in order to discover any movement and to intercept any communication with the garrison.