On the 28th of March the _Diana_ was sent to reconnoitre the Confederate position and strength on the lower Teche; but continuing on down the Atchafalaya, instead of returning by Grand Lake as intended, and thus running into the arms of the enemy, she fell an easy prey. The _Calhoun_ went to her relief, but ran aground, and the _Estrella_ had to go to the assistance of the _Calhoun_. Acting-Master James L. Peterson, commanding the _Diana_, was killed, and Lieutenant Pickering D. Allen, aide-de-camp to General Weitzel, was wounded. With the _Diana_ there fell into the enemy's hands nearly one hundred and fifty prisoners. This gave the Confederates three rather formidable boats in the Atchafalaya and the Teche. The movement of the troops was necessarily slow, as well by reason of the extremely limited facilities for transportation, as because of the state of the roads, but by the 8th of April every thing was well advanced, and on that day Banks moved his headquarters to Brashear. Weitzel, who had been reinforced by the siege-train, manned by the 1st Indiana heavy artillery, had already re-occupied his former front on Berwick Bay. Emory was in bivouac at Bayou Ramos, about five miles in the rear of Weitzel, and Grover at Bayou Boeuf, about four miles behind Emory. Thus the whole movement was almost completely masked from the Confederates, who from their side of the bay saw only Weitzel, and knew little or nothing of the gathering forces in his rear. So little, indeed, that Taylor, with his usual enterprise, seems to have thought this a favorable moment for attempting upon Weitzel the same operation that Weitzel had been so long meditating for the discomfiture of Taylor. Emory marched early in the morning of the 9th of April and closed up on Weitzel, who, an hour later, about ten o'clock, began to cross. No enemy was seen save a small outpost, engaged in observing the movement. This detachment retired before Weitzel's advance, without coming to blows. Weitzel at once sent his Assistant Adjutant-General, Captain John B. Hubbard, with Perkins's and Williamson's troops of cavalry and one section of Bainbridge's battery to discover the enemy's position. The Confederates were found to be in some force in front of Pattersonville, with their cavalry pickets advanced to within a mile of Weitzel's front. As soon as Weitzel had completed his crossing, and released the boats, Emory followed him. The four brigades bivouacked in front of the landing-place that night. The gunboats, having done the greater share of the ferriage, went back to the east bank for Grover.