Ok so the last mission is to Rally and go in to Solitude and take it over... I recently hit a solitude guard on accident and ran away, then went to fast travel to the nearest place to the gates, which happened to be a farm, when i got there a guard took me into the city to pay my bounty, when i got out everyone had already killed everyone and then i got into the room to kill General Tullious.. so i thought all was well until i started to do Dipolmatic Immunity quest, the soldiers were still outside and it wont let me into sollitude until i "defend the city with the stormcloak soldiers... what do i do.