while the battle is playing you can hit PageDown to lower the camera view, then UpArrow to move in close. Hit your "Print Screen" button (upper right of the keyboard usually) to grab the screen into a capture buffer.
Now leave the game or use something like Ctrl-Esc to drop it down to the bar. Open a paint program, choose Edit and Paste to pop your screen capture in. Then save it.
Now you have an image of the battle suitable for a web page or a background screen for your desktop
