Arriving at his destination before daylight, Custer posted his troops so as to be ready to meet the expected attack. Two troops, one from the First Michigan the other from the Sixth, commanded by Captain George R. Maxwell and Captain Manning D. Birge, respectively, were sent well out on the Brock road to picket the front. The line of battle was formed in the woods, facing a cleared space, beyond which dense timber served as a screen to prevent the enemy's approach from being discovered. The right was held by the First and Sixth Michigan, formed in two lines, regimental front, the Sixth in rear, the men standing "in place, rest" in front of their horses. It was prolonged to the left by the Fifth and Seventh Michigan and Devin's brigade, composed of the Fourth, Sixth and Ninth New York and Seventeenth Pennsylvania regiments of cavalry. Devin, however, did not arrive on the ground until the battle was well under way. The right of the line was "in the air," so far as was at that time known, the infantry not being in sight.
The open field directly in front extended some 200 yards beyond our position, to the right, and it was, perhaps, 500 yards across it to the woods. The timber in which we formed extended from the rear clear around the right and across the front. In other words, the patch of open ground was enclosed on three sides, at least, by dense woods. The alignment faced in a westerly direction, and was back in the timber far enough to be hidden from the approaching foe. To the right and as it turned out, somewhat to the rear, lay the army of the Potomac, which had been battling with Lee all the previous day; and orders had been issued for the fighting to be resumed at five o'clock in the morning.
Thus we stood, prepared, in a state of expectancy, awaiting the sounds that were to summon us to battle.
The brigade band was posted near the left flank of the First Michigan.
General Custer, alert and wary, with a portion of his staff and escort, was out inspecting the picket line.
The horse artillery had not yet arrived.
Every trooper was alert and ready for whatever might come.
The field, of which mention has been made, was bisected by a ravine, nearly diagonally from left front to right rear, the ground sloping into it from front and rear. This ravine was to play a prominent part in the battle that ensued.
Suddenly, the signal came. A picket shot was heard, then another, and another. Thicker and faster the spattering tones were borne to our ears from the woods in front. Then, it was the "rebel yell;" at first faint, but swelling in volume as it approached. A brigade of cavalry, led by the intrepid Rosser, was charging full tilt toward our position. He did not stop to skirmish with the pickets but, charging headlong, drove them pell-mell into the reserves, closely following, with intent to stampede the whole command.
It was a bold and brilliant dash, but destined to fall short of complete success.