at war with
Examples
Those who are at war with others are not at peace with themselves.
Be always at war with your vices, at peace with your neighbors, and let each new year find you a better man.
Everybody's at war with different things... I'm at war with my own heart sometimes.
The United States is not, and never will be, at war with Islam.
Remember, our hearts are one. Even when we are at war with each other, our hearts are always beating in unison.
We're at war with Japan. We were attacked by Japan. Do you want to kill Japanese, or would you rather have Americans killed?