Born in the Saddle/Playing With

Basic Trope: A whole culture revolves around horse-riding.
 * Straight: The Equestrii are a nomadic tribe whose economy is based on lightning raids of neighbouring towns. They sleep on horseback and their children start learning to ride as soon as they can sit upright.
 * Exaggerated: The Equestrii consider standing on the ground to be unlucky. Their gods are centaurs, and they treat their horses as Bond Creatures, paired at birth.
 * Downplayed: The Equestrii use predominantly cavalry-based Hit and Run Tactics in battle, and hunt on horseback, but that's as far as it goes.
 * Justified: Their homeland is a semi-arid steppe, and settling down anywhere is unfeasible. As a result they're constantly moving; driving sheep, hunting wild animals, and raiding others. Those who can't ride slow the tribe down, so they learn as soon as possible.
 * Inverted: The Agricoli had never seen horses until the Equestrii fell on their ancestors and decimated them. The events are Shrouded in Myth, but they remember the four-legged demon beasts their conquerors rode and kill them on sight.
 * Subverted: Alice has heard all the stories of the Equestrii, but when she's carried off in a raid she finds their civilian life isn't very horse-centric at all.
 * Double Subverted: ...until another branch of the tribe falls upon the weak, decadent Race Traitors who dare to live in mud huts and farm cows, put their village to the torch and steal their horses.
 * Parodied: The Gym Khanate are a savage tribe of once-little girls whose Pony Club was lost in the wilderness. They've become wild and ruthless bandits, but boy do they love their ponies.
 * Deconstructed:
 * Exploiting how the Equestrii rely solely on cavalry tactics, the Agricoli develop anti-cavalry weapons like bayonets and halberds. The next time the Equestrii attack, their armies are completely decimated by these new weapons.
 * The realities of having to care for all those horses are played up.
 * Reconstructed: The Equestrii we see are just their armies - they have a poor but civilised homeland where their civilians live lives of semi-nomadic subsistence farming, but never have to worry about warfare because their raiding parties have subdued the rival tribes for miles in every direction.
 * Zig Zagged: The Equestrii ride horses when it suits them, but they're perfectly willing to walk on two feet. They prefer to use Hit and Run Tactics and Horse Archery, but they know how to form a shield wall if they're pinned down. They're nomadic in winter, but tend to settle down over the milder months to grow crops and stock up for the winter.
 * Averted: None of the Barbarian Tribes have a particularly close relationship with horses, short of riding them in battle and on long journeys.
 * Enforced: What's a Medieval European Fantasy without Hordes From the East swooping down on horseback?
 * Invoked: The Equestrii aren't a particularly horsey people, but knowing how much the Agricoli are terrified of them the Khan orders his troops to stay on horseback at all times.
 * Exploited: The Khan wants the people of Agricola to think they're dealing with barbarous, bestial savages so that they'll underestimate his diplomats...
 * Defied: "You stupid farmers think we're joined to our horses at the hip, don't you? We just use them to move around quickly, we're not in love with the dumb beasts."
 * Discussed: "They say the Equestrii give birth to their children on horseback, you know. Some even say they have prophesied the coming of a centaur Messiah, and their priests lie with fillies to bring it about..."
 * Conversed: "Oh look, the Hordes From the East are yet another Mongol Expy..."

Trot on back to Born in The Saddle.