It’s been eight years since the Change rendered technology inoperable across the globe. Rising from the ashes of the computer and industrial ages is a brave new world. Survivors have banded together in tribal communities, committed to rebuilding society. In Oregon’s Willamette Valley, former pilot Michael Havel’s Bearkillers are warriors of renown. Their closest ally, the mystical Clan Mackenzie, is led by Wiccan folksinger Juniper Mackenzie. Their leadership has saved countless lives.

But not every leader has altruistic aspirations. Norman Arminger, medieval scholar, rules the Protectorate. He has enslaved civilians, built an army, and spread his forces from Portland through most of western Washington State. Now he wants the Willamette Valley farmland, and he’s willing to wage war to conquer it.

And unknown to both factions is the imminent arrival of a ship from Tasmania bearing British soldiers...

Ten years after The Change rendered technology inoperable throughout the world, two brave leaders built two thriving communities in Oregon's Willamette Valley. But now the armies of the totalitarian Protectorate are preparing to wage war over the priceless farmland.

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From Publishers Weekly

Stirling's Dies the Fire began an alternative history trilogy with a stunning premise: in 1998, the laws of nature suffered a mysterious change: gunpowder can't explode, electrical devices don't work-in short, the last 250 years of high-tech gadgetry suddenly are useless. This sequel shows what has happened to the world since the collapse of civilization. A group of people in the Pacific Northwest have joined together to rediscover old skills; Mike Havel, leader of the Bearkillers clan, and Wiccan priestess/folksinger Juniper Mackenzie help their followers adjust to new possibilities. Nearby, however, kinky former college professor Norman Arminger is exploiting his knowledge of medieval lore to manage the Protectorate, a brutal and ruthlessly-expanding dictatorship. This middle volume of the trilogy shows skirmishes between the factions, leading up to an inevitable confrontation. Stirling's pictures of ruined cities and towns are grimly convincing, and his loving descriptions of familiar landscapes gone wild are wonderful. If the people were as freshly imagined as their world, the novel would be splendid, but even with cardboard characters, it's still an extremely readable installment in a better than average tale.
Copyright © Reed Business Information, a division of Reed Elsevier Inc. All rights reserved.

From Booklist

The Bearkillers and Clan Mackenzie of Dies the Fire (2004) have spent the eight years since the Change, which left the world without such conveniences as electricity and gunpowder, carving out a home for themselves in the rich farmland of Oregon's Willamette Valley. The peace they enjoy is fragile, thanks to the Protector of Portland, Norman Arminger, who is ready to wage war to control the valley's farmland with methods derived from a medieval warlord: slavery, feudal oppression, and thugs running his army. The arrival of British survivors on a Tasmanian ship complicates matters, especially when they encounter Arminger first. The Mackenzie (i.e., clan leader), Juniper, brings a mystical attitude to the confrontation, and it begins to seem as though in this world without familiar technology, magic might in fact be just around the corner. The Bearkillers, meanwhile, are ever more influenced by Tolkien, thanks to the obsession of certain younger members. Stirling's blending of fiction and history produces a strange, hybrid civilization, in which the confrontation between warlord and mystic is viscerally satisfying. Regina Schroeder
Copyright © American Library Association. All rights reserved

The Protector's War (Emberverse Series #2) by S. M. Stirling

It’s been eight years since the Change rendered technology inoperable across the globe. Rising from the ashes of the computer and industrial ages is a brave new world. Survivors have banded together in tribal communities, committed to rebuilding society. In Oregon’s Willamette Valley, former pilot Michael Havel’s Bearkillers are warriors of renown. Their closest ally, the mystical Clan Mackenzie, is led by Wiccan folksinger Juniper Mackenzie. Their leadership has saved countless lives.

But not every leader has altruistic aspirations. Norman Arminger, medieval scholar, rules the Protectorate. He has enslaved civilians, built an army, and spread his forces from Portland through most of western Washington State. Now he wants the Willamette Valley farmland, and he’s willing to wage war to conquer it.

And unknown to both factions is the imminent arrival of a ship from Tasmania bearing British soldiers...