They're under a ruined overpass when he spots it, next to a quietly burbling stream.
"Hey, 2B, look at that."
"We do not have the forces for a direct assault. The junctions between the support and the town proper are likely to be more easily attackable, and damaging them will provide the lowest expected cost/benefit ratio."
"No one yet. We're still scouting. But given the situation it seems a prudent thing to prepare for."
"...I think we're miscommunicating somewhere. Could you lay out what you're thinking from the beginning?"