These points are admirably illustrated in the battle of the Brandywine. The danger of a flank attack upon his right wing was well understood by Washington; and as soon as he heard that Cornwallis was marching up the Lancaster road, he considered the feasibleness of doing what Frederick would probably have done,--of crossing quickly at Chadd's and Brinton's fords, in full force, and crushing Knyphausen's division. This he could doubtless have accomplished, had he been so fortunate as to have inherited an army trained by the father of Frederick the Great. But Washington's army was not yet well trained, and its numerical inferiority was such that Knyphausen's division might of itself be regarded as a fair match for it. The British movement was, therefore, well considered, and it was doubtless right that Washington did not return the offensive by crossing the creek. Moreover, the organization of his staff was far from complete. He was puzzled by conflicting reports as to the enemy's movements. While considering the question of throwing his whole force against Knyphausen, he was stopped by a false report that Cornwallis was _not_ moving upon his flank. So great was the delay in getting intelligence that Cornwallis had accomplished his long march of eighteen miles, and was approaching Birmingham church, before it was well known where he was. Nevertheless, his intention of dealing a death-blow to the American army was forestalled and partially checked. Before he had reached our right wing, Washington had ordered Sullivan to form a new front and advance toward Birmingham church. Owing to the imperfect discipline of the troops, Sullivan executed the movement rather clumsily, but enough was accomplished to save the army from rout. In the obstinate and murderous fight which ensued near Birmingham church between Cornwallis and Sullivan, the latter was at length slowly pushed back in the direction of Dilworth. To save the army from being broken in two, it was now necessary for the centre to retreat upon Chester by way of Dilworth, and this movement was accomplished by Greene with consummate skill. It was now possible for Knyphausen to advance across Chadd's Ford against Wayne's position; and he did so, aided by the right wing of Cornwallis's division, which, instead of joining in the oblique pursuit toward Dilworth, kept straight onward, and came down upon Wayne's rear. Nothing was left for Wayne and Armstrong but to retreat and join the rest of the army at Chester, and so the battle of the Brandywine came to an end. [Illustration: BIRMINGHAM MEETING-HOUSE]