In the late 1970s a particularly inept President of the United States allowed a dangerous military imbalance to occur. The Soviets had thousands of tanks poised to come crashing through the Fulda Gap and into West Germany. The only viable response of the hollowed-out US Army at that time was to fall back and thrownukes at the Ruskies in hopes of slowing them down. The Germans weren’t too happy about turning their country into a nuclear battlefield.
A few years prior a California science fiction writers (with ties to the former Governor and not yet President named Reagan) came up with a better solution: If you drop a hammer from the top of the Empire State Building, whatever it lands on will get hurt real bad. Now, imagine if the hammer were dropped from orbit. I don’t care how good Russian armor is; it won’t survive the experience. No radiation and no fallout. Everyone should be happy. Right? Except for the guys who think we should be in the UN. There are treaties against space-based weapons that probably don't apply, but....
Then the science fiction writer in question, Jerry Pournelle teamed with Larry Niven, to write a novel where they explored this notion. Since Tom Clancy already had the 3rd-World War franchise, Pournelle & Niven put these space-based weapons in the hands of alien invaders.
The novel Footfall shows an alien invasion of Earth and how we fight back. Yes, the aliens have advanced fusion technology, and they control the high ground of space. Pournelle and Niven depict the hammer-dropped-from-orbit concept and its deadly effect. As you’d expect, the alien invasion is a near run thing. Ultimately humanity abandons the UN Nuclear Test Ban Treaty and takes the battle into space against the aliens in an Orion-style ship. Cool stuff.
Fast-forward two decades. We have email, ebooks, Amazon.com and automatic alerts sent from Amazon suggesting novels you might like. I got one such notice suggesting To Defend TheEarth by William Stroock.
Just as everything else has advanced in the last twenty years, so has weapons technology. We have tactical lasers, smart bullets, and anti-artillery missiles. And so do the aliens in Mr. Stroock’s novel. They also have that hammer-dropped-from-orbit plot device. You might regard this as an update of Footfall to contemporary technology. But don’t. This book consists of a number of disconnected stories set in various points around the world. You never get to know any of the characters. Stroock tells a big story, and like H. Beam Piper’s novel Space Viking, it’s less of a novel and more of a novel outline. (By all means, you should read Space Viking, too.)
Instead of writing 11 short stories that each touch on a few characters’ experience in a narrow part of the war, Mr. Stroock would have been better off writing 11 novels following the same set of characters through the duration of the war.