On the 21st of May General Banks landed, and on the next day a junction was effected with the advance of Major-General Augur and Brigadier-General Sherman. His line occupied the Bayou Sara road. On this road General Augur had an encounter with a force of the enemy, which resulted in their repulse with heavy loss. On the 25th the enemy was compelled to abandon his first line of works. On the next day General Weitzel’s brigade, which had covered the rear in the march from Alexandria, arrived, and on the morning of the 27th a general assault was made on the fortifications. Three series of batteries extended along the river above Port Hudson to a point on Thompson’s creek, making a continuous line about three and a half miles in extent. Above Thompson’s creek is an impassable marsh, forming a natural defence. From the lower battery began a line of land fortifications, of semi-circular form, about ten miles in extent, with Thompson’s Creek for its natural terminus above. ATTACK ON PORT HUDSON, LA. MAY 27, 1863. It having been understood that a grand and simultaneous attack from every part of the lines encircling Port Hudson was to be made on Wednesday, the 27th, General Augur, as early as 6 A. M. of that day, commenced a heavy cannonade upon the works, which continued incessantly until 2 o’clock, P. M. At 10 o’clock, General Weitzel’s brigade, with the division of General Grover—reduced to about two brigades—and the division of General Emory, temporarily reduced by detachments to about a brigade, under command of Colonel Paine, with two regiments of colored troops, made an assault upon the right of the enemy’s works, crossing Sandy creek, and driving them through the woods into their fortifications. The fight lasted on this line until 4 o’clock, and was very severely contested. Brigadier-General Sherman, who intended to commence his assault at the same time on the left, had his troops in readiness. General Augur’s assaulting forces consisted only of Colonel E. P. Chapin’s brigade, viz., the Forty-eighth Massachusetts, led by Lieutenant-colonel O’Brien; the Forty-ninth Massachusetts, by Colonel F. W. Bartlett; the One Hundred and Sixteenth New York, led by Major Love; and the Twenty-first Maine, by Colonel Johnson; also two regiments of Colonel Dudley’s brigade, called up from the right, viz., the Second Louisiana, under Colonel Paine; and parts of the Fiftieth Massachusetts, under Colonel Messer.