Already the advanced guard of the Ist Army Corps was approaching by both the high-roads from Saarbrücken and Saarlouis; and its batteries having pushed on ahead, at once took part in the engagement. Passing through Lauvallier, the infantry followed close, climbed the eastern slope of the plateau of Bellecroix, and farther to the right drove the enemy out of the wood east of Mey. But the presence at this point of the main body of the French IIIrd Corps gave pause to the German offensive for the time.
The 13th, 1st, and 2nd Divisions had meanwhile followed their respective advanced guards, the two latter having been held in full readiness by General von Manteuffel ever since his outposts had reported that the enemy was moving. General von Zastrow, too, arrived on the field, and took over the command of the left wing. Soon sixty field-pieces were in action against the enemy. General von Osten-Sacken hurried forward the 25th Brigade through the hollow of Coincy, and climbed on to the edge of the upland. The clump of fir-trees on the road to Bellecroix was taken by storm, was surrounded on three sides, was lost again in a bloody conflict, and was once more recaptured. Soon afterwards two batteries succeeded in establishing themselves above Planchette, whose fire drove the French back as far as Borny; yet still the conflict raged on both sides with the utmost fury.
But now there threatened the German right the danger of being out-flanked. General Ladmirault, on learning that Grenier's Division had been driven out of Mey, immediately set out to its support with his other two Divisions, retook the village, and pressed farther forward by the Bouzonville road. General von Manteuffel had meanwhile given the necessary orders for holding, at all hazards, the deep-cut trough of the Vallières brook which covered the flank. The 1st Brigade was posted behind Noisseville as general reserve, the 4th, and part of the artillery of the Ist Corps, marched by the Bouzonville road to confront General Ladmirault near Poix, while the remaining batteries from the southern slopes to the eastward of Nouilly enfiladed his advance. On the left, Glümer's Division (13th) had all this time been holding its ground at Colombey, and now, at seven o'clock in the evening, Woyna's Brigade came to its assistance, and took possession of the copses westward of Colombey. A very welcome reinforcement now arrived from the IInd Army remaining halted on the Seille.