"Combeferre knows something of surveying too. He's tried to explain it to me a few times -- the principles make some sense, but if I had to put them into effect..." He shrugs, eloquently. He wouldn't know where to begin.

Bahorel can keep his possibly offensive pot of something with peppers. He's infinitely more adventurous with that kind of thing than Enjolras, who's going to start with some bread and cold meat and sliced fruit.

"What of soldiers and maps?" That's to Harry -- for reasons that are probably obvious to Bahorel, and may or may not be to Harry. Enjolras wants to know what Harry's distillation of the conversation will be, and what he thought of it.