positions, more especially the left and centre, with a view
gradually to draw from the left to add to the right; and we had to
hold our lines on the left extremely strong, to guard against a
sally from Kenesaw against our depot at Big Shanty. Garrard's
division of cavalry was kept busy on our left, McPherson had
gradually extended to his right, enabling Thomas to do the same
still farther; but the enemy's position was so very strong, and
everywhere it was covered by intrenchments, that we found it as
dangerous to assault as a permanent fort. We in like manner
covered our lines of battle by similar works, and even our
skirmishers learned to cover their bodies by the simplest and best
forms of defensive works, such as rails or logs, piled in the form
of a simple lunette, covered on the outside with earth thrown up at
night.

The enemy and ourselves used the same form of rifle-trench, varied
according to the nature of the ground, viz.: the trees and bushes
were cut away for a hundred yards or more in front, serving as an
abatis or entanglement; the parapets varied from four to six feet
high, the dirt taken from a ditch outside and from a covered way
inside, and this parapet was surmounted by a "head-log," composed
of the trunk of a tree from twelve to twenty inches at the butt,
lying along the interior crest of the parapet and resting in
notches cut in other trunks which extended back, forming an
inclined plane, in case the head-log should be knocked inward by a
cannon-shot. The men of both armies became extremely skillful in
the construction of these works, because each man realized their
value and importance to himself, so that it required no orders for
their construction. As soon as a regiment or brigade gained a
position within easy distance for a sally, it would set to work