The first thing Abster did when he reached Marcianopolis was walk.
Not toward anything. Just through it.
A real Roman city — forum, basilica, baths, temples, streets that were paved. A baker arguing with a customer in a doorway with the specific energy of a commercial dispute conducted entirely in good faith. A child chasing a dog through the forum while her mother called after her in Latin and Gothic simultaneously. That detail, he thought, filing it. No official document captures that.
He'd been in camps and encampments for seven months. He'd forgotten what a city smelled like — multiple smells, layered, human, alive in the way that a military camp was not alive. He'd forgotten what it was like to walk past a shop and hear merchants. He'd forgotten what noise that wasn't military sounded like.
The city was also visibly stressed.
The Gothic migration had pushed pressure up and down the frontier and Marcianopolis was absorbing all of it: refugees, disrupted trade, officials trying to manage something their training hadn't prepared them for. The baths were crowded. The forum was tense in the specific low-level way of a place waiting to find out what kind of trouble was coming.
He walked for an hour. Adjusted. Then went to find Sebastianus.
The headquarters was a former merchant's house.
Large enough for a staff. Modest enough to be a statement. Commanders who chose modest quarters on the frontier were making a choice about what they valued.
He filed that too.
Sebastianus was fifty. Lean the way men were lean when they'd never stopped moving. He had the specific alertness of a military mind that had been working on an unsolved problem for a long time without finding the solution — not defeated by it, just perpetually engaged.
Two staff officers were dismissed the moment Abster arrived. Another statement.
"Sit," Sebastianus said. "You're younger than I expected."
"People say that."
"How old?"
"Twenty-three."
Sebastianus looked at him steadily. "The analysis in your letter reads like a man who has been thinking about this for a decade."
"I've been thinking about it intensively for two months," Abster said. "But I had a strong foundation."
"From what? You're a garrison optio on the Danube."
"I read extensively." A pause. "And I had direct consultation with Gothic veterans who served previously in the auxilia. Their perspective on their own doctrine was more candid than I expected."
"You consulted Gothic veterans during a border crisis."
"Gothic veterans with Roman military experience understand both sides of the tactical problem. That's valuable." He met Sebastianus's gaze. "Rome has been treating everything Gothic as a threat to be managed rather than a resource to be integrated. That mistake has costs. Your tactical problem is partly a result of it."
Sebastianus said nothing. He turned to the maps on his wall.
Abster had been reading those maps since he sat down. The annotations. The deployment markers. The question marks at both flanks that said: Sebastianus has identified exactly the vulnerability that Gothic cavalry doctrine is designed to exploit.
"Tell me what you think the next engagement looks like," Sebastianus said.
Abster talked for forty minutes.
He drew on everything — framed as logical extrapolation from field observation, not foreknowledge. Gothic cavalry capabilities. Roman infantry vulnerabilities. The terrain around the most likely engagement zones. The command dynamics that would push a Roman general toward conventional frontal engagement rather than the defensive terrain-adaptive approach that would actually work.
Sebastianus listened without interrupting, making occasional notes, and Abster could see the quality of the attention — a mind not waiting for pauses to insert its own conclusions. Genuinely processing. Testing each statement against stored knowledge.
When Abster finished, Sebastianus set down his stylus.
"You're describing Adrianople," he said.
The name landed in the room like a stone in still water.
Abster held very still. "I'm describing the conditions that produce a catastrophic Roman defeat," he said carefully. "I don't know exactly when or where. I know the conditions are present and worsening."
A long silence.
"I've been saying versions of this for three years," Sebastianus said. "I have been ignored. Sidelined. Twice formally reprimanded for exceeding my advisory authority." He looked at Abster. "What makes you think it will be different now?"
"I'm not asking you to convince Valens." Abster leaned forward. "I'm asking you to prepare the units you can actually reach. Change what you can change from where you are. When the engagement comes — whatever form it takes — the units trained correctly will perform better than the units that weren't. That's observable. That's a record." He paused. "Records survive."
Sebastianus looked at him.
"You believe the record matters," he said.
"The record is the only thing that survives catastrophe and builds what comes after," Abster said. "Yes."
He stayed twelve days.
Three things of consequence.
First: He worked through Sebastianus's staff from dawn to late evening, transferring everything — the anti-cavalry drills, the flank-guard doctrine, the engineering modifications — into a format that could be implemented across multiple units simultaneously. Actual training manuals, written in the style of the military texts he'd read and memorized and was now reconstructing from memory with appropriate adaptation.
Flavius, Sebastianus's staff officer, took the drafts and rebuilt them for the specific conditions of the eastern frontier units. Methodical, competent, clearly relieved to have something concrete to work with. By the end of the fifth day he'd stopped asking confirming questions and started making improvements.
Good, Abster thought. This doesn't need to be mine. It needs to work.
Second: He met two other senior officers in Sebastianus's orbit. Not political appointments. Not Lupicinus's creatures. Actual military men trying to do an actual military job. He filed their names with the specificity of a man building an address book for future use.
Third: On the tenth evening, alone with Sebastianus, he said the thing he'd been building toward since the letter.
"Valens is going to fight," he said. The city was quiet outside. The lamp between them. "Whatever advice he receives, whatever the tactical situation is — he will choose to engage rather than wait. I'm as certain of this as I've been certain of anything."
Sebastianus looked at him. "You reason like a man who knows the future."
"I reason like a man who has studied patterns." He kept his voice level. "Emperors under political pressure who have something to prove tend to fight when waiting is the correct answer. Valens has something to prove."
"He does." Sebastianus said it quietly. "The court at Constantinople is not kind to him. His brother Valentinian had the west and the military reputation. Valens has spent a decade trying to establish his own."
"Then we can't stop the engagement." Abster leaned forward. "We can only change what happens inside it. The units we've trained need to be at the battle. Not in garrison. Not on the wrong part of the line. At the battle, in the right position, under commanders who understand what they're doing." He held Sebastianus's gaze. "Can you arrange that?"
A long silence.
"That requires influence I don't formally have," Sebastianus said.
"You have Corvus's network. You have the officers we met this week. You have the paper trail of tactical reform going into the official record now, which gives you standing to advise on deployment." Abster paused. "And you have time. Less than two years. But time."
Sebastianus sat back. Looked at the maps. Looked at Abster.
"You're twenty-three years old," he said. "And you're asking me to spend my remaining political capital positioning units for a battle you believe is coming."
"I'm asking you to spend it on what matters."
Sebastianus was quiet for a long time.
Then he said something Abster hadn't expected.
"My father was a soldier who spent his life doing the right thing too late." He looked at the lamp between them. "He knew what was needed. He hesitated. The moment passed." A pause. "I've spent twenty years afraid of becoming him."
He looked up.
"I don't think I'm afraid of that anymore."
Abster said nothing.
Some silences needed to be held.
Outside, Marcianopolis breathed in the winter dark. Somewhere in the city a dog was barking. A drunk was singing something off-key. Normal city sounds. The sound of a civilization that did not know what was coming and was living its ordinary life in the space before it arrived.
"There is one thing you should know," Sebastianus said, after a while. "Before you go back to your centurion."
Abster waited.
"Galbus's complaint reached the frontier legate's office last week." He said it without particular drama. "Your sector operational report had already arrived. The legate read both." He turned the stylus in his fingers. "He forwarded your report to the eastern command with a commendation. He forwarded Galbus's complaint to the cohort commander with a note that the optio in question was under review for temporary staff attachment." He paused. "The complaint is, functionally, resolved."
Abster absorbed this.
Not triumph. Something more complicated — the specific sensation of a system functioning in your favor for once, which was different from expecting it to function in your favor and was not the same thing as trusting that it would happen again.
"Thank you for telling me," he said.
"Go back to your century," Sebastianus said. "Finish the winter drills. Come spring, the temporary attachment will be formalized. You'll have rank to match the work." He stood. "And Abster—"
Abster paused.
"The document you sent me. The four-draft letter." A pause. "The fourth draft was the right choice. Most men would have sent the third."
Abster looked at him.
"How did you know it was the fourth draft."
"Because the third draft is what a man sends when he wants to be taken seriously," Sebastianus said. "The fourth draft is what a man sends when he wants to be right." He picked up his stylus. "There's a difference. Most men don't notice it."
He left Marcianopolis the next morning.
Cold, clear, the road north back toward the Danube. He'd borrowed a horse from Sebastianus's stables — a practical animal with no opinions about its rider, which was all he needed.
He rode and thought.
Galbus's complaint, resolved. Sebastianus, engaged. Flavius, building training manuals. Two officers whose names were now in his memory with a specific purpose. The paper trail in the official record.
Good, he thought. Forward.
Six hundred and four days.
He also thought about what Sebastianus had said about his father. About spending twenty years afraid of becoming the man who hesitated. About reaching the point where that fear stopped.
He thought about his own father, or the absence of one — left at a garrison gate as an infant by someone who had not left a note. He had no template for that fear. No father to become or not become.
He had Corvus, who had lost a son.
He had Wittaric, who was building something across the cultural divide for his daughter's sake.
He had Drusus, who thought in generations.
Maybe that's enough, he thought. People worth not-failing.
He rode north through the winter landscape, the road cutting through forest that was bare and grey and very quiet, and thought about the spring.
He arrived back at the camp on the thirty-first day of his absence — three days later than he'd told Pilo, because the road had been worse than expected and a bridge had required repair.
He came through the gate and found the morning drill in progress.
Pilo was running it.
Not performing running it — actually running it. Moving between positions, watching the formation, calling corrections in the specific direct way that Abster recognized as the voice of someone who understood what they were looking at.
He stopped at the edge of the drill space and watched.
Pilo's eye caught him. A fractional pause — half a second, recognition, relief, something that might have been pride quickly folded back into the work.
He kept running the drill.
Abster stood and watched until it finished. The men dispersed for breakfast. Pilo walked over.
"Three days late," he said.
"Bridge needed repair."
"I know. Tullus guessed." He paused. "Everything held."
"I can see that."
Pilo looked at him. "Rufus said you'd be fine."
"Rufus is usually right about things he claims not to care about."
"Yes." A pause. "The second combination needs work. The timing drifted while you were gone."
Abster looked at him.
Pilo had noticed a drift. Had identified the specific problem. Had held it until Abster returned rather than overcorrecting and causing a different problem.
"Show me after breakfast," Abster said.
Pilo nodded and went to eat.
Abster stood in the empty drill space and felt the cold and thought about what it meant that Pilo had just handed him a problem rather than a report. The difference between a subordinate managing in your absence and someone who understood the work.
Corvus was waiting at the century's command area with two cups of something hot and the expression of a man who had been tracking the situation and was ready for a briefing.
"Well?" he said.
"Sebastianus is engaged. The complaint is resolved. The tactical manuals are being written." Abster took the cup. "And I'll need to start preparing for a formal rank review in spring."
Corvus looked at him steadily. "How formal."
"Formal enough to need documentation."
"I've been building the documentation for six months."
"I know." Abster looked at the drill space, still marked with Pilo's footprints in the frost. "I know you have."
They stood in the cold with their cups and the camp morning moving around them, and the Gothic encampment visible over the wall, and the frozen Danube beyond that, and the steppe beyond that, and somewhere beyond the steppe the Huns moving through the winter like a weather system.
Six hundred and four days.
Forward.