Once was match occurs: 1. During preparation day go to "enemy team" 2. Bookmark them 3. Go to your "bookmarks" 4: Click on enemy team 5. Visit the players you are against 6. You can see the troops they are preparing & sometimes they are upgrading something that is hidden on war base

This is especailly useful an hour before war starts to see if they are doing lots of hogs, air, ground so you can set your bases to match.