This is the second in a series by S.M. Stirling, the first being Dies the Fire.
I know it got a number of crummy reviews on Amazon, but I liked it. Yeah, there isn't exactly a war like the title says, more of the buildup to it. I'm assuming that'll happen in the next book (I'm waiting eagerly for the paperback edition so I can get it, I want to know what happens next!)
I think the time jumps about 5 years from the end of the first book, so civilization is a little bit further along; we get to learn about some of the rest of the world, which is nice. Plus it's quite lengthy and I'm always a fan of a well written brick!