The Watchtower is the nickname given to a line of star systems on the edge of Humanspace that bordered the Ashvani Front during the Galactic War. It was considered a last line of defense against Ashvani invasion. These adventures cover the exploits of several elite military units along this front.
As a defense, the Watchtower largely failed and was partially overrun, with some disastrous results. One such tragedy was the burning of the atmosphere of the human colony world New Paris. (see “New Paris Is Burning”)
A Watchtower tale appeared in the ’90s SF anthology FTL2.