Three short lines, and a whole outlook packed into them. The speaker says they need some war, and then peace. It's an odd thing to ask for. Most of us would simply say we want peace. Here, peace only seems worth having once something has been fought through first.
The word "war" sits alone on its own line, and that isolation makes it feel heavy, almost blunt. Then "peace" arrives at the very end, as if the poem itself has to get through the conflict to reach it. The line breaks act out the wish: struggle, a pause, then release.
We can't know from the text whether the war is literal or personal. It might be an inner battle, an argument, or a restless need for change. The word "need" suggests something close to hunger or exhaustion, not a casual preference. The mood is tense but quietly hopeful, like someone who feels stuck and believes the only way to calm is through disruption.