I am so foolish. I had just gathered a army of Sardukar to strike, taking out the ordos little base at the edge of the map and was advancing down to the worm. I thought I'd save it. But then, I quickly clicked load instead and to load a save file. Before I knew it, I was on Geidi prime again, at the start. My heart sank, and black despair filled my soul. So does anyone have a savegame of the last mission :)