It is what it says in the title. This is a highly detailed description of a particular siege. Everything in it is to serve this particular goal. The protagonist has a little arc about coming into leadership, and everyone else has characterization that is competently done but limited to what a commander would want to know. I'm still not sure if I think the plot was going anywhere beyond faction 2 wants to take a strategic point and faction 1 wants to keep it. The prose is tasty, but very military and to the point. The descriptions for the preparation for and then execution of the battle are the entire book.

I think the quality here is very high. The book is certain to be someone's cup of tea, but it wasn't mine. I found myself wishing for some more complicated interpersonal dynamics, a more involved plot, or some literary themes. It was just a little too much of the military elements compared to everything else for me. However, I'm well aware that's just a matter of personal taste.