Here's something that bothers me about the BC attack on Arctis.  The BC must have known that the only thing keeping the Summer court from helping the council against the vamps was that winter was on summers borders.  So why would they attack Arctis and risk winter pulling back to defend its own territory, thus leaving Summer open to help the Council just as it did when harry 'attacked' Arctis?

This assumes that the BC wanted the red court to win and not for the war to be a distraction for both parties involved. An alternate, albiet unlikely, scenario is the BC attacked Arctis Tor to force mab to call reinforcements giving summer the chance to strike the red court.  In this theory the red court is doing too well and the BC needs the White Council to survive their current crisis.(Eb states how bad things are for them atm at the beginning of PG).   Unlikely I know but its fun to propse off the wall theories.