The attack was in most ways typical, of the kind that occurred nearly every season, though most often in summer. A pod of three, two males and one large female; it was thought by Soo Ramirez—and others were in agreement—that this was probably the same pod that had been sighted twice over the previous five nights, prowling near the fireline. It often happened this way, in discrete stages, spread over several nights. A group of virals would appear at the edge of the lights, as if scouting the Colony’s defenses; this would be followed by a couple of nights of no sign; then they would appear again, closer this time, perhaps one breaking away to draw fire but always retreating; then, on a third night, an attack. The Wall was far too high for even the strongest viral to mount it in a single leap; the only way for them to ascend was along the metal seams between the plates, employing these slender cracks, caused by the inevitable shifting of the plates, as toeholds. The firing platforms, with their overhanging steel nets, were positioned at the tops of these seams. Any viral who made it this far was usually fogged by the lights, sluggish and disoriented; many simply retreated at this point. Those who didn’t would find themselves hanging in an inverted position under the nets, giving the Watcher on station ample opportunity to shoot them in the sweet spot with a crossbow or, failing this, to take them on a blade. Only rarely did a viral make it past the net—Peter had seen this occur only once during his five years on the Wall—but when one did, it invariably meant the Watcher was dead. After that, it was simply a question of how weakened the viral was by the lights and how long it took the Watch to bring him down, and how many people died before this happened.