Android permissions
This page describes the permissions that War.app's Android app requests and why.
Wake Lock
While you are watching a turn play out (watching attacks and deployments happening), War.app prevents your device from turning the screen off. To do this, the app needs to request the Wake Lock permission.
This is necessary since it's common for players to not be touching the screen while watching a turn play out, causing the device to think you're not using it.
Internet and Access Network State
The War.app app needs to contact the internet since it's a multi-player game. Single-player games take place mostly on your device, so it doesn't need to record every move on the server when playing single-player. However, the app will still talk to the War.app server in single-player, but only to download maps, thumbnails, and a few other minor things.
Photos
If you want to use the app to upload a photo to your war.app profile or your clan, then the app will request permissions to access your photos accordingly. Photo access is not used for anything except what you explicitly choose to upload.