war·fare 
(wôrfâr′)
(wôrfâr′)n.
1.
a. The waging of war against an enemy; armed conflict.
b. Military operations marked by a specific characteristic: guerrilla warfare; chemical warfare.
2. A state of disharmony or conflict; strife: constant spousal warfare in the household.
3. Acts undertaken to destroy or undermine the strength of another: political warfare.
[Middle English : warre, war; see WAR + fare, journey (from Old English faru, from faran, to journey; see FARE).]