One day, when it is possible to get in and around Lens, the veil will be torn from a human charnel-house, or, rather, from charnel-houses which none of us may yet enter or see through the drifting smoke. Yesterday I looked down on Lens and saw its roofless buildings and its gaping walls, but I could only guess at the scenes which are hidden below ground there in the tunnels where the Germans assemble for their counter-attacks against the Canadians, and to which they drag back their dead and wounded. Those places must reek with the smell of death and corruption, for the losses of the Prussian Guards during the last few and of other divisions who have come up against the Canadians, have been, I am told and believe, enormous. The Canadians tell me that their troops have never had harder or more prolonged fighting, not even in their old days of the Ypres salient nor on the Somme. Every hundred yards of the ground they have taken, and during the last week or so they have taken thousands of yards of open country and of ruined streets in and about the mining cités, until they have forced their way into Lens itself, have been contested by desperate fighting and held against unceasing counter-attacks delivered by great bodies of picked German troops supported by monstrous bombardments. Imagination can, if it likes, picture the slaughter involved in all this to those German assault troops, because they have not succeeded in gaining their purpose, and counter-attacks like that, in those numbers and in that strength, are shattered when they do not succeed. It is a wonderful tribute to the Canadians and to their grim tenacity that, after all the repeated counter-attacks against them, and after storms of fire from batteries which have increased in number every day, they hold their lines round Lens intact as they stood on August 15 and 16, and have gained an entry into the streets of Lens and swung up southwards with increasing pressure. Lens is packed tight with German troops. They belong to the 4th Guards Division, and latterly to the 1st Guards Reserve, the crack division of the German army, which had a month's rest at Cambrai before being sent into this slaughter-house. For although that city is tunnelled throughout, all the cellars being linked up and strengthened with massive concrete, so that even heavy shells cannot pierce down to them, men cannot fight in tunnels if they are on the offensive, and must get out of them to make their counter-attacks. It is at those times that they suffer more hideously than in any other battle.