Forewarned that he must look for the enemy to make his appearance on the Chambersburg and Carlisle roads,[33] and feeling that there was warm work ahead, Buford was keeping a good lookout in both directions. To that end he had now taken post on a commanding ridge over which these roads passed first to Seminary Ridge, and so back into Gettysburg. First causing his troopers to dismount, he formed them across the two roads in question in skirmishing order, threw out his vedettes, planted his horse-artillery, and with the little valley of Willoughby Run before him, the Seminary and Gettysburg behind him, and the First Corps in bivouac only five miles away toward Emmettsburg, this intrepid soldier calmly awaited the coming of the storm, conscious that if Gettysburg was to be defended at all it must be from these heights. A pretty little valley was this of Willoughby Run, with its green banks and clear-flowing waters, its tall woods and tangled shrubbery, so soon to be torn and defaced by shot and shell, so soon deformed by drifting smoke and the loud cries of the combatants. The night passed off quietly. Nevertheless, some thirty thousand Confederates, of all arms, were lying in camp within a radius of eight miles from Gettysburg. Their vanguard had discovered the presence of our cavalry,[34] and was waiting for the morning only to brush it away. [Sidenote: Heth comes down the Pike.] Next morning Heth's division was marching down the Chambersburg pike, looking for this cavalry, when its advance fell in with Buford's vedettes. While they halted to reconnoitre, these vedettes came back with the news that the enemy was advancing in force, infantry and artillery filling the road as far as could be seen. Warned that not a moment was to be lost, Buford at once sent off word to Reynolds, who, after ordering the First Corps under arms, and sending back for the Eleventh, himself set off at a gallop for Gettysburg, followed only by his staff. [Sidenote: He drives Buford.] Buford's bold front had thus caused the enemy to come to a halt; but soon after nine, supposing he had to do with cavalry alone, Heth deployed his skirmishers across the pike, forming his two leading brigades at each side of it; these troops then pushed forward, and soon the crack of a musket announced that the battle of Gettysburg had begun. [Sidenote: Wadsworth comes to Buford's Aid.] After an hour's stubborn fighting, Buford was being slowly but surely pushed back over the first ridge, when a column of the Union infantry was seen coming up the Emmettsburg road at the double-quick. It was Wadsworth's division arriving in the nick of time, as the enemy's skirmishers, followed by Archer's brigade, were, even then, in the act of fording the run unopposed, and unless promptly stopped would soon be in possession of the first range of heights. It was really a neck-and-neck race to see who would get there first. [Sidenote: Reynolds forms the Division.]