Multiverse: Book 1: Hell's Gate

Magic and high tech collide in this exciting military SF novel from bestseller Weber (War of Honor) and Evans (Far Edge of Darkness), the first of a new series. Two human societies, the Sharona and the Union of Arcana, have evolved in parallel universes without encountering another civilization, human or otherwise. The Sharona exhibit a level of technology roughly analogous to the late 19th century, with psionic abilities thrown in for seasoning, but the Arcana have harnessed magical energies down to the consumer level. Astonishingly, it's the magical society that suffers the greater shock when one of their companies encounters a small Sharona civilian survey team and is almost annihilated by the enemy's repeating firearms.