Drilling fluids system for Korean HDD contractor

　Jon hobbled across to Satin and grabbed him by the shoulder. “With me,” he shouted. Together they moved to the north parapet, where the King’s Tower looked down on the gate and Donal Noye’s makeshift wall of logs and barrels and sacks of corn. The Therms were there before them.
　　They wore halffielms, and had thin bronze disks sewn to their long leather shirts. Many wielded bronze axes, though a few were chipped stone. More had short stabbing spears with leaf -shaped heads that gleamed redly in the light from the burning stables. They were screaming in the Old Tongue as they stormed the barricade, jabbing with their spears, swinging their bronze axes, spilling corn and blood with equal abandon while crossbow quarrels and arrows rained down on them from the archers that Donal Noye had posted on the stair.
　　“What do we do?” Satin shouted.
　　“We kill them,” Jon shouted back, a black arrow in his hand.
　　No archer could have asked for an easier shot. The Thenns had their backs to the King’s Tower as they charged the crescent, clambering over bags and barrels to reach the men in black. Both Jon and Satin chanced to choose the same target. He had just reached the top of the barricade when an arrow sprouted from his neck and a quarrel between his shoulder blades. Half a heartbeat later a longsword took him in the belly and he fell back onto the man behind him. Jon reached down to his quiver and found it empty again. Satin was winding back his crossbow. He left him to it and went for more arrows, but he hadn’t taken more than three steps before the trap slammed open three feet in front of him. Bloody hell, I never even heard the door break.
　　There was no time to think or plan or shout for help. Jon dropped his bow, reached back over his shoulder, ripped Longclaw from its sheath, and buried the blade in the middle of the first head to pop out of the tower. Bronze was no match for Valyrian steel. The blow sheared right through the Thenn’s helm and deep into his skull, and he went crashing back down where he’d come from. There were more behind him, Jon knew from the shouting. He fell back and called to Satin. The next man to make the climb got a quarrel through his cheek. He vanished too. “The oil,” Jon said. Satin nodded. Together they snatched up the thick quilted pads they’d left beside the fire, lifted the heavy kettle of boiling oil, and dumped it down the hole on the Therms below. The shrieks were as bad as anything he had ever heard, and Satin looked as though he was going to be sick. Jon kicked the trapdoor shut, set the heavy iron kettle on top of it, and gave the boy with the pretty face a hard shake. “Retch later,” Jon yelled. “Come.”
　　They had only been gone from the parapets for a few moments, but everything below had changed. A dozen black brothers and a few Mole’s Town men still stood atop the crates and barrels, but the wildlings were swarming over all along the crescent, pushing them back. Jon saw one shove his spear up through Rast’s belly so hard he lifted him into the air. Young Henly was dead and Old Henly was dying, surrounded by foes. He could see Easy spinning and slashing, laughing like a loon, his cloak flapping as he leapt from cask to cask. A bronze axe caught him just below the knee and the laughter turned into a bubbling shriek.
　　“They’re breaking,” Satin said.
　　“No,” said Jon, “they’re broken.”
　　It happened quickly. One mole fled and then another, and suddenly all the villagers were throwing down their weapons and abandoning the barricade. The brothers were too few to hold alone. Jon watched them try and form a line to fall back in order, but the Thenns washed over them with spear and axe, and then they were fleeing too. Domish Dilly slipped and went down on his face, and a wildling planted a spear between his shoulder blades. Kegs, slow and short of breath, had almost reached the bottom step when a Therm caught the end of his cloak and yanked him around . . . but a crossbow quarrel dropped the man before his axe could fall. “Got him,” Satin crowed, as Kegs staggered to the stair and began to crawl up the steps on hands and knees.
　　The gate is lost. Donal Noye had closed and chained it, but it was there for the taking, the iron bars glimmering red with reflected firelight, the cold black tunnel behind. No one had fallen back to defend it; the only safety was on top of the Wall, seven hundred feet up the crooked wooden stairs. “What gods do you pray to?” Jon asked Satin.
　　“The Seven,” the boy from Oldtown said.

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