In these times the unbidden stranger finds us swift and hard.
It is important to notice that, while Men, the people of Rohan are not the same as the Numenoreans; neither the distant Rangers of Arnor, nor their allies in Gondor. They are strongly distinct.
A younger nation of different ethnic stock; a simpler culture, less 'high' and learned; and an impetuous and warlike national character. They throw the Men of the West into striking contrast - the Eorlingas are the fledgling Norse to Gondor's decadent, dimished Greece or Rome.
We first meet the Rohirrim, fittingly, galloping across the Eastemnet down the trail of the Orcs they have just destroyed; brave yet suspicious, long hair flailing in the wind. Their 3rd Marshall describes his people with proverbs as unvarnished as he.