A determined and desperate struggle ensued, which lasted, with occasional intermissions, till late in the afternoon. Shaver's brigade, which, after a severe and protracted contest, had overcome Peabody's brigade of Prentiss' division, was ordered to the attack upon the left of McClernand's line. Advancing across a wide and open field, he encountered so hot a fire in front and on his right flank, that his brigade recoiled back to the shelter of timber and halted paralyzed, till later in the day he was ordered to attack in another quarter. General B.R. Johnson was wounded, and his brigade so severely handled that it retreated from the field, leaving its battery, Polk's, behind. McClernand's whole division advanced in line, pushing the enemy back half a mile through and beyond his camp. This success was only temporary. Changing front to meet fresh attacks, refusing first one flank, then the other, clinging desperately to his camp, but, on the whole, shifting slowly back from one position to another, he formed, in the afternoon, in the edge of timber on the border of an open field, and here, during a pause of half an hour, supplied his command with ammunition. The respite was followed by a more furious assault. Falling back from his camp toward the river, to the farther side of a deep ravine running north and south, being the continuation of the valley or ravine of Brier Creek, he formed his line, facing west with wings refused, the centre being the apex, and still connecting on the right with the remnant of Sherman's division. Several fitful onslaughts at intervals forced McClernand to refuse his left still farther.