That gets into questions about whether the clans should have imploded sometime in the 2800s. Realistically, yes.
But since they didn't, they're a full fledged bunch of psudo-aliens in what is hand-waved to be a nation-state-equivilant capable of industrial-warfare levels of production. Somehow.
Not having the book, what's your problem with the terrain?
consider the whole scenario as Colt Ward presented it, and ask yourself "Does this make any sort of logical sense?"
and keep in mind: using a dropship as close air support is a
terrific way to lose your dropship, even if the enemy only has ground weapons, nobody has air cover because...'reasons', and the people with the lower tech are putting themselves in a shooting gallery running along the bottom of a canyon system
that they don't have good maps of without functional overwatch of any sort and no reconaissance assets out, the Lyran dropship rabbitted because site security was weak and again, 'why not?'
These hardened troops Colt described, acted like greenies from top to bottom. this is largely due to writers being limited-if they're not themselves strategic geniuses, it's hard to show strategic or tactical genius except to make the losing side look...well...
incompetent in at least three ways:
Leadership incompetence
Structural or Doctrinal incompetence
and
Incompetently trained troops.
this goes to meme/cliche territory when it gets overused on a fictional faction yet that faction continues to exist past the first book.
The Steiners/Lyrans have been consistently unable to get their shit together forever-their 'successes' in all previous eras being due to being in one way or another Davion sidekicks. The fat, rich, dumb sidekicks you use for comedy relief as they pal with the designated Hero (tm), the bulk of the times this isn't true, they're the grasping, greedy, and somewhat dim villains.
narratively this is consistency in action-the setting doesn't really change much even if the map reshapes a few times, but it also establishes their 'destiny'. Trillian gets to be 'kinda competent' but only as long as she's aligned with Stone and Davion. Why? because
she's just the sidekick. her entire faction is
just the sidekicks.
either way, it's not a good example of either how to build a raid scenario, or a raiding force.