home front

noun

the civilian sector of a nation at war when its armed forces are in combat abroad.

Origin of home front

First recorded in 1915–20

Related formshome-front, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Lacking a political approach with respect to Hamas, Israel has invested in defending its home-front while boosting deterrence.
Israel: Stop Isolating Gaza
Benedetta Berti
April 17, 2013

Even so, the unprecedented series of catastrophes on the home-front of America overshadows everything.
The Brain
Alexander Blade

also homefront, by 1917, from home (n.) + front (n.) in the military sense. A term from World War I.