Is it correct grammar to say The war is done?

While "The war is done" is grammatically correct, it's often considered too informal or incomplete. It's better to use more precise language to convey your intended meaning.

Here are some alternative ways to express the same idea:

* The war has ended. (This is the most neutral and straightforward option.)

* The war is over. (This is similar to "has ended" but can also imply a sense of finality.)

* The war is finished. (This emphasizes the completion of the conflict.)

The best choice depends on the specific context and the nuance you want to convey.