Lee moved into Pennsylvania with enormous confidence. At Gettysburg he came unexpectedly upon the main Union army, which first retreated, then regrouped and entrenched on a range of hills outside the town. For the next two days Lee "attempted to dislodge the enemy." He argued later that victory would have been won had his lieutenants attacked simultaneously. As General George Pickett's men returned from their failed charge on the last day, Lee put all of the blame on himself. He then retreated into Virginia.