rearguard has definitions from the field of military
[ noun ] (military) a detachment assigned to protect the rear of a (retreating) military body

Used in print

(Gibson Winter, The Suburban Captivity of the...)

Since American life is committed above_all to productivity and a higher standard of economic life , the countervailing forces of residential and religious exclusiveness have fought a desperate , rearguard action against the expanding interdependence of the metropolis .

Related terms

detachment military