Original text was found here on Quora, but I'll copy it here as well.

Great machines crawled across the snow; and in the midst was a huge walker, great as a forest-tree a hundred feet in length, striding on mighty legs. Long had it been forging in the dark smithies of Kuat, and its hideous head, founded of dura-steel, was adorned with deadly blasters. AT-AT they named it, in memory of the AT-TEs of old. General Veers piloted it, and a legion of storm troopers followed in its train.

But about the base’s blast door resistance still was stout, and there the hardiest of the Rebels stood at bay. Blaster and laser fire fell thick; AT-STs crashed or blazed suddenly like torches. All before the base on either side of the blast door the ground was choked with wreck and with bodies of the slain; yet still driven as by a madness more and more came up.

The AT-AT crawled on. Its steel hide no blaster could pierce. Over the hills of slain a hideous shape appeared: a cyborg, tall, cloaked in black. Slowly, trampling the fallen, he strode forth, heeding no longer any blast. He halted and held up a crimson lightsaber. And as he did so a great fear fell on all, defender and foe alike; and the hands of men drooped to their sides, and no blaster sang. For a moment all was still.

With a lurch the AT-AT sighted on the blast door. It fired. A deep boom rumbled through the base like thunder running in the clouds.

Then the Cyborg raised his hand and cried aloud in a dreadful voice, speaking in some forgotten tongue words of power and terror to rend both heart and steel.

Thrice he cried. Thrice the great machine fired. And suddenly upon the last blast the door broke. As if stricken by some blasting spell it burst asunder: there was a flash of searing lightning, and the doors tumbled in riven fragments to the ground. In strode the Lord of the Sith. A great black shape against the snow beyond he loomed up, grown to a vast menace of despair. In strode the Lord of the Sith, and all fled before his face.