Royal Convoy Wishlist, huh. What do they have that we wouldn't normally be able to get, other than some more opportunities to spend RP? I guess some experienced soldiers? Not Grenadiers specifically, but ones who won't get scarred from some chanting.
Then, I suggest taking 20 Mercs, 30 Soldiers, 10 Grenadiers, 2 Natives, 2 Gatling Trucks, and both Gliders, and take on those Snake Tribe Natives at the Lost City. I'd suggest the Maxim Gun, but it sounds pretty unwieldy. I guess we could post it at the entrance with the 2 gatling trucks? We would lead the expedition, of course, unless someone has another idea.