Mission 8: Sunjiang District

i've just done the Boreas Seabed - Luxon Mission , but i have no idea what to do next to get to the next mission of Mission 8: Sunjiang District.... can someone help me out

"Do City Under Attack which leads to Raisu Pavilion, there take and complete Battle in the Sewers which leads to Sunjiang District."

http://gw.gamewikis.org/wiki/Mission...iews_(Factions)

thank you v. much