At three o'clock four of their Divisions advanced towards the Tronville copses. Barby's cavalry brigade (11th), watching the western verge, had to retire before the enemy's fire, and the German infantry occupying the wood also had to yield to a strength so superior; the batteries which were in action between Vionville and the copses were assailed in rear from the west through the glades of the copses, and were likewise forced to retire. But not until the lapse of an hour did the French succeed in overcoming the obstinate resistance of four staunch battalions. At the subsequent roll-call near Tronville, it was ascertained that the 24th Regiment had lost 1000 men and 52 officers, and that the 2nd Battalion of the 20th Regiment had lost all its officers. The 37th demi-Brigade, which of its own accord had been fighting valiantly in support since noon, took possession of the village of Tronville and prepared it for an obstinate defence. It was not till after three that the IIIrd Corps, which had been fighting for seven[9] hours almost single-handed, received effective assistance. While the Xth Corps was on the march through Thiaucourt, its advanced guard heard cannon-fire from the direction of Vionville. The Corps Commander, General von Voigts-Rhetz, immediately set out for the battle-field, and having personally ascertained how matters stood, he sent back the requisite orders to his approaching troops. In this instance again it was the artillery which, hurrying on in advance, masterfully struck into the conflict. Its fire, in conjunction with that of the promptly further advancing batteries of the IIIrd Corps, checked the French rush made on both sides of the Tronville copses simultaneously. At half-past three the head of von Woyna's Brigade (39th) fell on, drove the enemy back into the wood, and finally, supported by Diringshofen's Brigade (40th), took possession of its northern outskirts. The right wing of the IIIrd Corps had also received some reinforcement.