Conquest: Conquest means gaining control over territory by force or military campaigns. The rapid expansion of an empire usually involves conquest of new lands.
Horseback Warfare: Horseback warfare refers to battles fought on horseback. The Mongols were renowned for their exceptional horsemanship and effectively utilized it as a key strategy during their rapid expansion.
Siege Warfare: Siege warfare involves surrounding and attacking a fortified city or castle until its defenses are breached. The Mongols employed siege tactics to conquer heavily fortified cities during their expansion.