It certainly was a great mistake on Mr. Lincoln's part to order General McDowell off on a wild-goose chase after Jackson. The cooperation of this force might have enabled General McClellan even then to retrieve his campaign, and we do not in the least blame him for feeling bitterly the disappointment of wanting it. But it seems to us that it was mainly his own fault that there was anything to retrieve, and the true occasion to recover his lost ground was offered him after his bloody repulse of the enemy at Malvern Hill, though he did not turn it to account. For his retreat we think he would deserve all credit, had he not been under the necessity of making it. It was conducted with great judgment and ability, and we do not love that partisan narrowness of mind that would grudge him the praise so fairly earned. But at the same time it is not ungenerous to say that the obstinate valor shown by his army under all the depression of a backward movement, while it proves how much General McClellan had done to make it an effective force, makes us regret all the more that he should have wanted the decision to try its quality under the inspiration of attack. It is impossible that the spirit of the army should not have been affected by the doubt and indecision of their general. They fought nobly, but they were always on the defensive. Had General McClellan put them at once on the aggressive, we believe his campaign would have been a triumphant one. With truly great generals resolve is instinctive, a deduction from premises supplied by the eye, not the memory, and men find out the science of their achievements afterwards, like the mathematical law in the Greek column. The stiffness rather than firmness of mind, the surrender of all spontaneous action in the strait-waistcoat of a preconceived plan, to which we have before alluded, unfitted him for that rapid change of combinations on the great chess-board of battle which enabled General Rosecrans at Murfreesboro to turn defeat into victory, an achievement without parallel in the history of the war.