Taking down TH7 players with 10 Dragons is very easy.Town Hall 8 players can still be 3-star cleared, but not every TH8 player can be cleared.Town Hall 7 players are much easier to take down with a 10 Dragon army, as players get a third Air Defense upon hitting TH8.The spells and strategies you use depend on whether or not you are attacking a Town Hall 7 player.Since Dragons require a level 9 Barracks, it is in your best interest to level up all of your Barracks to level 9 shortly after hitting Town Hall 7 (upgrade each Barracks one at a time until all are level 9 so that you do not suffer from low production at any point).It is much easier to get excess Elixir to pump into Dragons as opposed to getting the 900+ DE required to build a 25+ Hog Rider army Technically, a 25+ Hog Rider army will outperform 10 Dragons, but that is an enormous waste of Dark Elixir.If you want to take on mid-range TH8 players, it is useful to have a Dragon in the Clan Castle and to upgrade your Dragons to level 2.The best army composition at Town Hall 7 for War Battles is to use 10 Dragons.