Here's a list of problems with that "intel" you have there about the Heshans:
A) It's Heshan, from Hesh, not Keshans, from Kesh.
B) Heshan troops are in foreign and unfamiliar territory, and were not even allowed to camp within the safety of the walls- they are hardened warriors. It is unlikely anyone would get them to talk so soon, to possible enemies. Everyone is foreign; everyone is a possible spy or assassin.
C) Heshans are warriors- attempts to wheedle information out of them would be met with cold glares, even if they were drunk. It's also likely they'd still beat you senseless before falling, too.
D) There is the northern icy tundra of Hesh, then there is the central deserts, and then the southern grasslands. It's all primarily flat- but it's not infertile. Desert is desert, but rivers provide lifeblood that makes otherwise inhospitable land very fertile and very much farmable.
E) Women are not so much warriors. They're more like the gems- they're protected and fit into traditional roles of women. Many, many people are unlikely to put a sword into a woman's hands.
F) You might want to add that they are clansmen- very much obviously. Kaz is the only one with heavy metal armor, and that's very, very expensive metal armor. Stuff that would rival a king's armor, though simpler and yet seeming more valuable at the same time.

So essentially, you need to get soldiers to relax before they talk, and these are elites from a continent-conquering force. Unlikely that you'll get them drunk enough to spill without even inviting them inside the walls. At best, they're offended by the gesture, especially with the approaching blizzard. At worst, they're likely to sick a knife between your ribs and take your money.