Pulteney's 3rd was moving towards collision on the left. It detrained from St. Omer on the 11th, drove the Germans out of Meteren on the 13th, occupied Bailleul and Armentières and then crossed the Lys, gaining a line from Le Gheir, north of Armentières, to Bois Grenier by the 17th. An attempt to clear the right bank farther north failed against the opposition of the German front from Radinghen to Frelinghien and thence along the river. Here, too, the way was barred, but north of the Lys there was as yet no stable control. There were some French and British cavalry and some weak detachments of infantry; but Haig's 1st Corps had not yet completed its transport from the Aisne, Rawlinson's 7th Division was being expanded into a 4th Corps, and the Belgian Army was painfully making its retreat from Antwerp. On the 13th Von Beseler was in Ghent, on the 14th in Bruges, and on the 16th in Ostend. The outflanking here was being done by the Germans with uncomfortable rapidity. On the day that the Germans entered Ostend, the Belgians were driven out of the forest of Houthulst and took refuge far behind the Yser. Four French cavalry divisions recovered the forest on the 17th, but the 7th British Division which had occupied Roulers on the 13th was driven back to a line south-east of Ypres running through Zandvoorde, Gheluvelt, and Zonnebeke (see Map, p. 288). D'Urbal's 8th French army now, however, came up to support the exhausted Belgians and assist in holding the Yser from Dixmude to the sea, where British warships were assembled to harass the German flank along the dunes; and Sir John French thought the moment had come for an offensive wheel round Menin towards the Scheldt. Haig's 1st Corps was expected shortly to fill the gap between Rawlinson's 4th and D'Urbal, and Rawlinson was instructed to advance on the 18th, seize Menin, and then await Haig, who was to move through Ypres on to Thourout, Bruges, and Ghent. In England it was confidently expected that the Germans, who had arrived at Ostend on a Friday, would enjoy but a week-end visit to the seaside resort, and the newspapers were not more sadly optimistic or ill-informed than headquarters in France. The orders given on the 18th and 19th could only have been the outcome of complete ignorance of the strength of the German Army, which was as much underestimated by the Intelligence Department on the spot as it was later exaggerated by writers on the campaign. In reality four new German Corps were already at Brussels or Courtrai mainly from Württemberg and Bavaria, and although the presence in them of men with grey beards and boys with none gave rise to some ill-timed satisfaction in the British press, these Landsturm troops were not to be despised. Rawlinson moved on Menin on the 19th, but was stopped three miles away by the German masses coming from Courtrai, and had to entrench on a line running east of Gheluvelt. On the same day the 1st Corps detrained at St. Omer and marched towards Ypres.