...exandria on the 6th, at the same time that Banks' advance-guard arrived, after taking possession of Fort De Russy on the way, which had been abandoned by the enemy. The Federal army, which had left Opelousas on the 5th of May, was concentrated at Alexandria on the 9th. When, after the battle of Port Gibson, Grant decided to undertake an immediate campaign against Pemberton, he invited Banks, as we ha...