The Baron's line reached the outer hedge a little past mid-morning, and it was there, at the low crossing Alaric had flagged as the valley's weakest point three days before, that the fighting truly began.
Wat had spent the fortnight preparing exactly this ground, and Thomas watched, from the second tower where Elias had insisted he stand rather than risk himself at the line, as the first rank of hired swords crossed the hedge and found the earth beneath them suddenly, violently alive — a shallow trench of quicklime and sulfur, sealed beneath a thin crust of ordinary soil, that Wat's men ignited with a single dropped torch the instant enough boots had crossed to make the ground worth burning.
It was not a great fire, not the kind that could level a shed or char a wall. It was worse than that, in its way — a low, choking cloud of caustic smoke that rolled across the advancing line and turned sixty confident men into a coughing, blinded, panicked mass within the space of a few terrible minutes, the acrid stink of it carrying even up to the tower where Thomas stood watching his own careful chemistry do exactly what he had built it, three years ago and against his own conscience, to do.
He had told himself, building it, that it was meant only to blind and choke, never to kill outright — a defense, not a massacre. Watching men stumble and retch and fall in the smoke below, he understood, with a coldness that would sit in his chest for a long time afterward, that the distinction mattered a great deal to his own conscience and almost nothing at all to the men choking on the ground.
The line broke. Not all at once — the Baron himself, from what Elias could make out through the drifting smoke, tried twice to rally a second push, shouting from horseback while his own men fell back around him in ragged, coughing disorder. But a force that had come expecting the mere sight of its numbers to end the matter had no answer for ground that fought back on its own, and by the time the smoke thinned enough to see clearly, the Baron's column had broken into a disordered retreat back toward the milestone, dragging their choking wounded with them.
It was not a clean victory. Thomas descended from the tower to find the trench-line littered with men too badly affected by the smoke to retreat with their fellows — six of them, by Aldith's hurried count, coughing blood into the churned mud, one boy no older than Diccon lying entirely still.
"He's alive," Aldith said, already working over him with the same brisk, unhurried competence she'd brought to every burn and fever the valley had ever handed her, though her hands, Thomas noticed, were not quite steady. "Barely. I need him moved to the schoolhouse now, and I need whoever else can still stand to help me carry the rest."
Victoria arrived at the trench-line moments later, her face streaked with soot from helping empty the lower stores, and stood for a long moment looking at the wreckage of what Thomas's chemistry had done — the churned earth, the groaning wounded, a single abandoned banner trampled into the mud a few yards from where the fighting had actually reached.
"You won," she said quietly.
"I don't feel like I won anything." Thomas looked at the boy Aldith was working over, at the six others being carried, one by one, toward whatever mercy the schoolhouse could offer men who had come here to burn his valley and instead nearly died choking in a trench of his own design. "I built something to keep people from dying, Victoria. I just used it to make sure other people did instead."
"You used it to keep the people who trusted you alive," she said, and there was no comfort in her voice, only the same hard, unflinching honesty she brought to everything. "That doesn't make what happened out there anything other than terrible, Thomas. It also doesn't make it wrong. Both of those things are true at once, and I think you're going to have to learn to hold them at the same time, the way the rest of us are about to have to learn it."
Alaric found them there a few minutes later, having ridden the perimeter to confirm the retreat was genuine and not merely a feint. His face, when he reported it, held none of the satisfaction Thomas might have expected from a man who had just watched his former lord humiliated.
"He's pulled back to the castle," Alaric said. "I don't believe he'll return this season — not with six men too injured to march and a proclamation now proven to have cost him considerably more than it gained. But I would not call this finished, Lord Thomas. A man like the Baron does not learn humility from a single defeat. He learns, at best, patience, and turns his attention toward whatever weapon he hasn't tried yet."
Thomas looked out at the trench-line one final time — the smoke thinning into the pale spring sky, the wounded being carried toward whatever care the valley could offer them, the whole terrible, necessary cost of a peace he had never wanted to defend this way — and found he had no argument left in him against Alaric's grim assessment.
The Baron was gone. The war, he understood, watching the last of the smoke drift away over a field neither side had wanted, was very far from over.