Conn Iggulden - Conqueror (2011)

Behind him, the cannon teams whipped horses dragging the heavy cannon, straining for the last burst of speed up the ridge. Kublai and Bayar had experimented with oxen and horses, even camels, trying to find the best combination of speed and stamina. Oxen were painfully slow, so he had left them in camp with the families and used teams of four horses. Once the guns were rolling, they could triple the speed to the front, though the cost in horses was enormous. Hundreds of them would be lame or have had their wind broken pulling the guns, as well as the carts full of shot and gunpowder.

Kublai readied his orders in his head. The Sung had formed quickly on the valley plain and he saw the dark shapes of their own cannons dragged to the front, ready with braziers to light the black powder. To charge that camp would be to ride through a hail of shot, and Kublai felt his gut tighten in fear at the thought. He scowled as he saw that the Sung regiments were holding their ground, certain that he had to come to them.

Kublai sent single warriors out ahead of the tumans. Thousands of eyes on both sides watched them walk their mounts down the gentle slope. The Mongol warriors waited to see if they found hidden trenches or spikes in the grass, while the Sung regiments tensed at what could have been the first outriders of a suicidal charge. The braziers by the Sung cannon smoked furiously as their tenders fed in fresh coal, keeping them hot. Kublai could feel his heart thumping as he waited for one of the riders to fall. His emotions were mixed when they reached the bottom safely and rode on to the edge of arrow range. They were young men and he was not surprised when they stopped to jeer at the enemy. It was more worrying that the Sung commander had not set traps. The man wanted them to ride in fast and hard, where he could destroy them. It was either justified confidence or complete foolishness and Kublai sweated without knowing which. His riders returned to the ranks amidst shouts and laughter from those that knew them. The tension had been unbearable, but with a glance Kublai saw four of his own cannon were ready, their braziers lit and smoking, well clear of the piles of powder bags and shot balls. The rest were still hitched to the teams that dragged them, poised to move closer once they saw the range. He told himself the Sung could not have expected so many of the heavy weapons.

He still hoped to surprise them. The Persian chemists working in Karakorum had produced a finer powder, with more saltpetre than the Chin mixture. Kublai understood little of the science, but smaller grains burned faster and threw the ball with more force. The concept was clear enough to anyone who had ever fried a slab of meat, or seen it cut into small pieces for cooking. He watched anxiously as the four cannon were hammered loose from their mountings and fresh wooden blocks put in to raise the black muzzles to the maximum elevation. The blocks often shattered on firing and the teams drew them from sacks of spares, each one hand-cut from birch. Powder bags were shoved down the iron tubes and on each team a powerfully built man lifted a stone ball, straddling it as if he were giving birth. With a massive heave, the balls were raised to the lip and another of the team made sure it did not fall back. For an instant, Kublai had almost ordered a second powder bag, but he dared not risk the guns exploding as they fired. He would need every one.

Three-quarters of a mile below and across the valley floor, the Sung regiments waited in perfect, shining ranks. They could see what was happening on the ridge, but they stood like statues, their flags and banners flapping. Kublai heard his gun teams shout instructions, using those same flags to judge the wind. They began to chant, with an emphasis on the fourth beat. Almost as one, the iron weapons were heaved around, lifted by main force and groaning men. The shots would fire straight until the wind changed.

Kublai raised his hand and four tapers were lit and shielded from the breeze as the officers readied themselves to touch the reed filled with the same black powder, the spark that pierced the bag within and slammed the balls out into the air.

Kublai dropped his arm, almost flinching in anticipation. The sound that followed had no comparisons. Even thunder seemed less terrible. Smoke and flame spurted from each of the iron holes and blurs vanished upwards. Kublai could see the curving lines and his heart raced faster as he saw they would surely reach the Sung. His mouth fell open as the cannonballs soared over the regiments, striking too far back for their damage to be seen.

There was a moment of stillness, then every man who could see suddenly roared and the rest of the cannon teams lashed their horses with fresh urgency, bringing them up. They could hit the enemy. Either the Sung had misjudged the benefit of the ridge, or the Mongol gunpowder was much better than their own.

Kublai shouted fresh orders, overcome with a sense of urgency to use his sudden advantage. He watched the painfully slow adjustment as the teams grabbed up heavy hammers and began to bang out the blocks while others lifted the iron barrels to make a space.

On the valley floor, horns wailed and conflicting orders were given in sudden confusion. Kublai could see that some of the Sung officers thought they merely had to pull back closer to the mine. Others who had seen the balls pass right overhead were shouting angrily and pointing up at the ridge. There was no safe spot for them to stand. They would either have to attack or abandon the mine and move out of range, in which case Kublai decided he would take the tumans in quickly and capture their guns. He tensed as his gun teams readied all the cannon for a massive volley.

When it came, the balls of polished stone skipped and bounced their way through the Sung ranks. Horses and men crumpled as if a point of hot iron had been laid onto them. Two of the Sung cannon were struck, flipping over and crushing men underneath. Kublai exulted and his teams worked on, pouring with sweat.

The shots came faster, rippling along the line as they sought to outdo each other. Kublai looked round in shock when one of the iron weapons burst its barrel, killing the men at the muzzle. Another man was killed when his companion failed to cool the barrel quickly enough with the long rammer and sponge. The powder bag went up while he was still pushing it down, tearing it open in his enthusiasm. The rush of flame could only find a path past him and he burned in an instant. The mad pace slackened slightly after that, the lesson not lost on the other teams.

Kublai was too far away to see Bayar’s expression, though he could imagine it. He had weapons designed to pulverise a city wall and the chance to use them against standing enemy ranks. The warriors around him were still stunned by the damage the cannons could inflict and Kublai wondered if they would be as fast to ride against the Sung weapons, now that they had seen in daylight what cannons could do.

The Sung lines re-formed over their dead, but Kublai did not think they would stand for long in the face of such murderous fire. He did not envy the Sung commander, whoever he was. He waited for the Sung to pull back, but they stood their ground while red claws sank into their ranks. Kublai glanced at the pile of stone balls nearest to him and bit his lip as he saw it was down to barely a dozen. Sheer weight made it as difficult to move the shot as the guns themselves and some of the carts had broken on the trip. He watched almost mesmerised as the pile dwindled until the final ball lay on its own. The barrel was sponged out for the last time. A billow of steam hissed and crackled over the men around them, part of a greater cloud that hid the entire ridge. It irritated Kublai by drifting across his sight, making him blind for long moments until the air cleared. He heard the cannon team fire the last shot, and by then most of the thundering guns had fallen silent, their teams standing proudly to attention. A few more shots sounded from slower teams and they were done at last, suddenly useless after the carnage and destruction.