Ammen's brigade was sorely pressed. Constituting the left of the army, it was in constant risk of being turned. Bruce's brigade, now put in hazard by the recession of Hazen, could give only indirect assistance to Ammen. Just then, Terrill's regular battery, of four twelve-pounders (Napoleons) and two ten-pound Parrotts, having arrived from Savannah, and missed its way to McCook's division, was ordered by General Buell to Nelson's relief. Dashing out to the skirmish line in front of Colonel Ammen, in order to get the range of the enemy's batteries, Terrill's guns became the target of the concentrated fire of the opposing batteries and the line of infantry. He was compelled to retire; but, firing as he retired, he kept at a distance the long line that followed and essayed to charge. Colonel Tuttle, who had been marching what was left of W.H.L. Wallace's division in reserve, in rear of Nelson and Crittenden, sent the Second Iowa forward in aid of Terrill. At the same time the Fortieth Illinois, of McDowell's brigade, Sherman's division, which had been marching in reserve to Nelson, filed to the front around Ammen's left flank, and the Confederate line retired to their position in the timber. Ammen's line, which fell back under the galling fire called out by Terrill's artillery charge, now returned to the front and occupied the timber where the enemy had been. It was now nearly two o'clock. There was no more fighting in Nelson's front. Terrill's battery suffered so severely that the Sixth Ohio was detailed as its special support, and supplied artillerists from its ranks. From an advanced position in Nelson's front, upon his skirmish line, this battery succeeded in opening an enfilading fire upon the troops in front of McCook, and one section advanced far enough to take in reverse the batteries that were engaged with Crittenden and McCook.