Angel Armies: Releasing the Warriors of Heaven
This book is phenomenal. With much study and revelation, Tim Sheets has written not only a book about angels but a book about who we are in Christ. One of the best points he brings up is, why do so many Christians expect demonic activity more than they expect angelic activity, especially considering the fact that there are more on our side, and God has already won. Angel Armies talks about who angels are, why they were created, what their role is in heaven and on earth, what they act like, what they do, etc. Plus at the end of the book, Tim writes decrees to dispatch them.