The barracks had been garrisoned by Indians until late in the current campaign season, when Chinese volunteers had broken into the ground floor and occupied it. The Indians who’d been using it as a base retreated up the stairs to the first story, then, a few days later, to the second story and the roof. Since then, after being resupplied by drones, they’d made some headway with a counteroffensive down a fire stairway, but at the moment held only a beachhead on the disputed first story, three-quarters of which was still Chinese-held. Barricades had been thrown up by both sides to fortify that line. The Line of Actual Control, in other words, had become a three-dimensional Surface of Actual Control, and you needed augmented-reality glasses to visualize its convolutions.