Out of the Dark by David Weber
The Hegemony, a galactic entity overseeing all the technologically advanced member species, decided to visit earth a long time ago. What they witnessed left them shocked and dismayed. They didn’t see us humans at our best. They happened to stumble across one of the bloodiest battles in our history – Agincourt. Now, almost a thousand years later a member of the Hegemony, the Shongairi, return to Earth. Instead of seeing how we’ve advanced, they decide in light of what was witnessed before that we don’t deserve another look see, instead they decide to take us over to become a client (read: slave) race. Needless to say they have greatly underestimated the human race.
The story mostly deals with the human offensive in North America, especially North Carolina, and Romania. The Shongairi, what Americans derisively call puppies, have never met with much resistance, nevermind human weaponry. For those who love Tom Clancy and knowing all about weaponry types and bullet calibers as well as fans of human will triumphing over all. Great on audio, the reader really keeps you engaged. And I won’t say who ultimately comes to humankind’s rescue. You’ll have to read it to find out.