And so we come to the final mission of the prologue. A sad, but inevitable conclusion, otherwise there wouldn't be much of a game to follow. Or, at the very least, it would be a rather different kind of story, rather than roughly following the timeline of Return of the Jedi.
The biggest difficulty in this mission is keeping your cargo container undamaged. Carrying it blocks your ventral gun turret, and makes it vulnerable to damage while you engage enemy fighters. Your best strategy is to drop the cargo when you engage the fighters, then come back and pick it up when the coast is clear.