Outside the Universe by Edmond Hamilton

The moment that followed was one of action and combat on such a scale as to stun the senses. Even as the great fleet of our galaxy rushed forward upon the serpent-fleet that had recoiled before it, the far-scattered ships of our own great armada had had time to rush in toward me again, to mass behind me. Then, as my fingers flashed down on the signal-keys, our own Andromedan fleet and the mighty galaxy-fleet above us were leaping as one toward the serpent-ships! Before those ships had time to dodge us we were upon them, the galaxy-fleet flashing above them and our own beneath them, and as we flashed thus above and beneath them thousands of deadly force-shafts struck up toward the serpent-ships from beneath, while from above countless brilliant crimson rays burned down toward them.

It was a scene unimaginable, that, as the three great fleets crossed and clashed. Three titanic armadas, each of thousands of close-massed mighty ships, that whirled and struck and ran there in the space between the crowding stars, three far-distant universes coming at last to death-grips within one of those universes. Flashing beneath the serpent-fleet it seemed that in all the firmament above us was but a single vast mass of oval ships, and as our invisible force-shafts stabbed up in swift revenge toward those ships they were crumpling here and there, collapsing and falling, whirling away toward the nearest of the thundering suns about us, while other ships among and above them were flaring wildly in great explosions of crimson light and vanishing as the annihilating rays of the fleet of the Federated Suns struck down upon them from above.