The icy Pannonian wind blew between the rows of leather tents, carrying the scent of imminent snow and damp wood smoke. Lucius found refuge in a secluded corner, behind a stack of supply crates, where the incessant noise of the camp, swords sharpening, centurions shouting, horses neighing, seemed a little more distant.

  He sat on a felled oak log, his calloused, soot-stained hands reverently holding the small papyrus scroll Noble Valerius had given him. The wax seal was intact, the personal mark Selena had used, likely borrowed from the noble's house as they never had a seal of their own.

  Lucius broke the wax carefully, as if disarming an explosive. His hands trembled slightly, not from the cold, but from anticipation. He unrolled the paper, and his eager eyes scanned the handwriting he himself had taught her to improve.

  "To my husband, Lucius, wherever the eagle of Rome has taken you," the letter began.

  Selena's words were simple but charged with a contained emotion that hit Lucius in the chest. She described the days at Villa Valerius, the safety of the high walls, and the plentiful food that, for the first time in years, was not a daily worry. She told him Lucia was growing fast, running through the marble gardens as if born a patrician, and that the girl asked for her father every night before sleep, praying to the gods to bring him back to tell stories.

  But the letter's tone changed in the second paragraph.

  "Winter here in Italy has arrived with a fury the elders say they haven't seen in decades," she wrote. "Snow covered the hills too early. Crops still in the fields were lost. If we were still on the outskirts, in that cold apartment where wind cut through the cracks, I fear we would not have survived. If hunger didn't take us, the cold or the cruelty of men like those collectors would have. Your decision to accept patronage saved us, Lucius."

  She continued, reporting rumors she heard from servants going to market.

  "The price of grain doubled in a week. There are whispers in the streets of a great famine coming. State warehouses are being rationed. But here, under Valerius's protection, we lack nothing. I am grateful every day, but my soul will only be at peace when you return."

  She ended with words of affection and longing. Lucius knew she couldn't write or read, and he felt grateful to whoever was helping her.

  Lucius lowered the letter, feeling a lump in his throat so tight it hurt to swallow. He had to bite his lower lip to hold back the tears threatening to well up. A Roman soldier didn't cry, they said, but that man inside the armor was still the Lucius from the future, the engineer who had never had anyone and now had everything.

  He put the letter away with extreme care, folding it and placing it inside a waterproof leather pouch next to his chest, under the chainmail, close to his heart.

  "I need to write a reply," he thought. "I need to tell them I'm okay, that the plan is working. I need to send instructions to stock dry food, even inside the noble's house. Famines breed chaos, and in chaos, even palaces tremble."

  He breathed deeply of the freezing air, trying to regain his stoic posture. He opened the palm of his right hand and looked at the iron and gold ring Valerius had given him. The imperial eagle symbol shone dully in the weak daylight.

  That object was heavy. Not physically, but symbolically. It was the key to doors that would remain locked to a plebeian for a thousand generations. It was proof that he, an intruder in time, was shaping history around him.

  "I won't let anyone down," he whispered to himself, closing his fist over the ring. "Not the noble, not the army, and especially, not them."

  Lucius stood up. The movement made his new armor clink. Valerius hadn't been joking when he said he would make him look important. Besides the ring, Lucius now wore a double-mail lorica hamata, with shoulder reinforcements, far superior to the standard issue. Over it, a thick wool cloak, dyed a deep red, almost wine-colored, fastened by a gilded bronze fibula. It wasn't a general's cloak, but it certainly distinguished him as someone of authority, a high-ranking technical officer.

  He walked toward the Immunes sector. His presence now commanded attention.

  "With me!" ordered Lucius, his voice projecting the authority the ring conferred.

  Immediately, a group of thirty men—carpenters, blacksmiths, and combat engineers—dropped their dice games and tools, standing ready. Lucius also requested an escort of four heavy infantry legionaries, just to ensure his passage through the crowded camp was unimpeded.

  He marched at the head of the group, his firm steps crushing the frozen mud. They crossed the camp's main thoroughfares, passing tribunes' tents and campaign altars, until they reached the bank of the Danube River.

  The sight was grand and intimidating. The river was a wide, dark beast, running violently. On the bank, activity was feverish. Dozens of pontoon bridges, boats tied side-by-side with wooden planks on top, were being launched or reinforced. It was Roman engineering in its rawest and most efficient form: speed and standardization.

  Lucius stopped at a high point on the bank, observing the sector Valerius had indicated. There, a more ambitious structure was being attempted: a bridge on wooden piles driven into the riverbed, intended to be more permanent than the pontoons.

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  He observed with the critical eye of a modern civil engineer. What he saw was phenomenal for the time. The Romans used floating pile drivers, powered by pulleys and human strength, to sink oak trunks into the silt. Discipline was absolute.

  "But it's too narrow," Lucius analyzed mentally. "They are building for infantry. Two men side-by-side, maybe a tight cart. If we try to pass the six-wheeled carts I designed, or heavy siege weapons, this bridge will bottleneck the invasion or collapse under the weight."

  He needed something better. Something that used Roman robustness but with the load distribution he knew. He wanted trusses. He wanted triangular reinforcements.

  Lucius turned to one of the escort legionaries.

  "Soldier," he called. "Go to that command tent down there. Find the chief of this sector. Tell him the Chief Campaign Engineer requires his immediate presence."

  "Yes, sir!" The soldier struck his chest and ran down the slope.

  Lucius waited, watching the water flow and calculating current speed. A few minutes later, the soldier returned, accompanied by a man who appeared to be Lucius's age, perhaps thirty.

  The man wore a good quality military tunic and hardened leather muscle armor, indicating he was a technical officer, perhaps a lower-level Praefectus Fabrum or a military architect. He climbed the slope wiping mud-stained hands on a cloth, but upon seeing Lucius, the red cloak, shiny armor, and command posture, his eyes widened slightly.

  The man stopped and gave a formal salute, bowing his head with a respect reserved for nobility.

  "Salve, sir," the man said. "I was informed of your arrival, though I did not expect someone of... such stature."

  Lucius suppressed a smile. In his mind, he found the situation ironically strange. He, who weeks ago carried stones, was now mistaken for aristocracy. The habit makes the monk, and the armor makes the tribune, he thought. But he knew he needed to maintain this fa?ade. Authority was the only currency that bought quick obedience in that army.

  "Salve," Lucius replied, keeping his face impassive. "I am Lucius. Noble Titus Valerius has appointed me Chief Campaign Engineer and personally charged me with the supervision and optimization of this sector."

  Lucius raised his hand, showing the signet ring for a brief second, enough for the other to recognize the crest.

  The man swallowed hard and straightened his posture even more.

  "It is an honor, Chief Engineer. I am Quintus Aelius, architect in charge of the Fourth Engineering Cohort."

  Aelius seemed confused. He had never heard of a "Lucius" in Rome's architecture academies, nor knew any noble family with that name linked to engineering. But Valerius's ring was a direct order forged in gold. He accepted the hierarchy immediately.

  "How can I help, sir? We are following the standard schedule for the crossing."

  Lucius looked at the river, pointing to the stretch of the bank.

  "How many crossing sectors do we have active, Aelius?"

  "This is the left flank sector, sir," Aelius explained, pointing east and west. "There are ten more sectors along the designated bank, besides the central sector, which is the main one, where the First Cohort is working on the Emperor's bridge. Each sector has orders to build an access route to cross troops simultaneously."

  "I understand," Lucius murmured. Eleven simultaneous bridges. The scale was impressive. But Roman redundancy often hid individual inefficiencies.

  He turned his attention back to Aelius's work. The bridge advanced slowly, pile by pile. The crossbeams were simple, resting directly on the pillars.

  "Your bridge, Aelius," Lucius began bluntly. "It is solid for marching. It will hold infantry without complaint. But look at it. It is narrow. And the span between piles is too short, creating resistance against the current and accumulating debris. If the river rises with rain or thaw, water pressure will knock these pillars down like twigs."

  Lucius turned to him.

  "Furthermore, it won't withstand the constant flow of heavy supplies I plan to pass through here. It won't pass many men at once, and if a cart breaks in the middle, the whole army stops."

  Aelius frowned, defensive but respectful.

  "Sir, we are following the standards of Apollodorus's manual. It is the proven method. Making larger spans would require beam sizes we don't have prepared, and..."

  "We are going to redo this bridge," Lucius interrupted, his calm voice cutting through excuses. "Not everything. We will use what is already driven into the riverbed as a base, but we will expand the platform. We will create lateral trusses to distribute weight, allowing us to use lighter wood to cover larger spans. And we will widen the deck to allow double flow."

  He wanted to apply the Warren truss principle or something similar, using wooden triangles to give rigidity to the structure without adding excessive weight. It was a concept that existed rudimentarily, but Lucius was going to apply it with mathematical precision. He wanted Roman construction speed fused with modern structural efficiency.

  Aelius paled slightly. He looked at the sun, already beginning to dip below the horizon, dyeing the sky purple and orange.

  "Sir... with all due respect," the architect tried to argue, anxiety showing. "The deadline is already tight. The General expects this crossing ready in two days. I pushed my men to the limit to get where we are. Redo the design now? The sun is already setting. We don't have time for such abrupt changes."

  Lucius approached Aelius, placing a hand on the man's shoulder. It wasn't an aggressive gesture, but firm, conveying confidence.

  "Don't worry about the deadline, Aelius. Time is relative to work efficiency. What we do will save days of future maintenance."

  In his mind, Lucius already saw the complete structure. He saw the force vectors, saw where every nail should go.

  "Do you have a place where I can write and draw?"

  "Yes, sir," Aelius replied, resigned. "My personal tent is right there, with tables and papyrus."

  "Excellent. Take me there," Lucius ordered.

  Before following the architect, Lucius stopped and turned to the group of Immunes he had brought with him and to Aelius's sub-officers watching the conversation.

  "Pay attention!" Lucius shouted, his voice echoing over the water noise. "I want you to stop placing crossbeams now. Aelius, give the order."

  He looked into the architect's eyes.

  "And I have a clear order for you and your men: collect as much wood as you can. Trees, trunks, planks, spare beams. Empty the depots if necessary. I want piles of wood ready on the bank by the time I finish what I'm going to do."

  Aelius looked at the darkening sky.

  "But sir... in an hour it will be dark. We cannot work in darkness. The risk of accidents on the river is high, and men won't see the joints."

  Lucius smiled, a smile of someone holding the knowledge that unsolvable problems often require only a change of perspective.

  "It won't be that dark, Aelius," Lucius replied. "Order all available torches brought. Prepare controlled bonfires on the banks. We will make stakes with fire baskets suspended over the water."

  He began walking toward the tent, gesturing for the other to follow.

  "We are going to turn night into day. We will work in continuous shifts. While I draw the new design, your men prepare the light and wood. Trust me, Aelius. Tomorrow morning, you will start to see a bridge like no other on this river."