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It was at Port Gibson I first heard through a Southern paper of the complete success of Colonel Grierson, who was making a raid through central Mississippi. He had started from La Grange April 17th with three regiments of about 1,700 men. On the 21st he had detached Colonel Hatch with one regiment to destroy the railroad between Columbus and Macon and then return to La Grange. Hatch had a sharp fight with the enemy at Columbus and retreated along the railroad, destroying it at Okalona and Tupelo, and arriving in La Grange April 26. Grierson continued his movement with about 1,000 men, breaking the Vicksburg and Meridian railroad and the New Orleans and Jackson railroad, arriving at Baton Rouge May 2d. This raid was of great importance, for Grierson had attracted the attention of the enemy from the main movement against Vicksburg.
During the night of the 2d of May the bridge over the North Fork was repaired, and the troops commenced crossing at five the next morning. Before the leading brigade was over it was fired upon by the enemy from a commanding position; but they were soon driven off. It was evident that the enemy was covering a retreat from Grand Gulf to Vicksburg. Every commanding position from this (Grindstone) crossing to Hankinson's ferry over the Big Black was occupied by the retreating foe to delay our progress. McPherson, however, reached Hankinson's ferry before night, seized the ferry boat, and sent a detachment of his command across and several miles north on the road to Vicksburg. When the junction of the road going to Vicksburg with the road from Grand Gulf to Raymond and Jackson was reached, Logan with his division was turned to the left towards Grand Gulf. I went with him a short distance from this junction. McPherson had encountered the largest force yet met since the battle of Port Gibson and had a skirmish nearly approaching a battle; but the road Logan had taken enabled him to come up on the enemy's right flank, and they soon gave way. McPherson was ordered to hold Hankinson's ferry and the road back to Willow Springs with one division; McClernand, who was now in the rear, was to join in this as well as to guard the line back down the bayou. I did not want to take the chances of having an enemy lurking in our rear.
On the way from the junction to Grand Gulf, where the road comes into the one from Vicksburg to the same place six or seven miles out, I learned that the last of the enemy had retreated past that place on their way to Vicksburg. I left Logan to make the proper disposition of his troops for the night, while I rode into the town with an escort of about twenty cavalry. Admiral Porter had already arrived with his fleet. The enemy had abandoned his heavy guns and evacuated the place.