馬車が崖から真っ逆さまに転落して木っ端微塵に大破し、乗客も御者も一人残らず全員が即死した

Finally, the horses, having lost control of the reins, could not clear a curve on the winding mountain pass and plunged headlong down the cliff at a terrifying speed. Due to the impact of the violent crash, the stagecoach was smashed to smithereens, and all the passengers harboring their respective dreams and love died instantly along with the driver, without a single survivor.