As of the battle of Hoth, the Rebel fleet was scattered across the galaxy. The loss of their main base of operations (Hoth) was obviously a significant blow, so they spent quite a lot of time running from the Imperial fleet and trying to regroup without being followed.
"Grant Allen [...] had written a book about the Evolution of the Idea of God. [...] it would be much more interesting if God wrote a book about the evolution of the idea of Grant Allen." ~ G. K. Chesterton, The Everlasting Man