I guess when you want to be a guide to nerds, you have to be a uber-nerd. There is a degree of mansplain competitiveness amongst hardened <anything> specialist tourism, people who seek to edgelord it out with the guide over some microfactoid.

That said, there's also the thing that people have a strong sense of connection with bits of history, and this is one of those bits, and it's nice the guides can try to work out where your nth squared great grand-uncles substitute stood, in that amazing charge. Probably over there. near the wall made in 1871 out of the rubble left over when the significant object of this fight was destroyed in a storm.

(seriously I admire docents, they have to work bloody hard to cope with the random stuff people ask. And these guides undoubtedly know their stuff)