The Combine were growing. Gordon Freeman may have been securing City 17's safety but this far-reaching military dominatrix was already consuming city after city. They were growing cleverer too, managing to use ex-human soldiers to read Earth books to them in the Combine native language. One particular novel excited them; it was a well known novel, partly for it's insight and partly because it was just a captivating story.
After reading Nineteen Eighty-Four by George Orwell, The Combine knew what they had to do to succeed. The Citadel had fallen so the Ministries could rise.

A work in progress. Should be good to get a bit of Team Deathmatch going on this map, say the Rebels have invaded the Ministry or something.