Then another counterattack was made by the First and Fourth Ontarios of General Mercer's First Brigade. The Fourth Ontario captured the German shelter trenches and held them for two days, when they were relieved. The Third Canadian Brigade held its position in spite of being opposed by many times their numbers and almost overcome by the gas fumes. The Forty-eighth Highlanders, who had had to withstand the gas, rallied after their retreat and regained their former place in the front. The Royal Highlanders kept their original position. Yet there was every indication of a rout. The roads were clogged by the night supply trains going forward and the rush of men trying to escape from the deadly gas. The staff officers found it impossible to straighten out the tangle, and the various regiments had to act almost as independent bodies, It was not until early the following morning, April 23, 1915, that the first reenforcements of British soldiers appeared to fill the breach. These men, for the most part, were from the Twenty-eighth Division, and had been east of Zonnebeke to the southeast corner of Polygon Wood. So great was the pressure at the section where the break had been made in the line that troops were taken from wherever available, so that the units in the gap varied from day to day. For the men had to be returned to their original positions, such as remained available, as soon as possible. This composite body of troops has been called Geddes's Detachment. The Germans had captured Lizerne and Het Sas, and Steenstraate was threatened by them. They bombarded with heavy artillery, located on the Passchendaele ridge, the front held by the Canadians, the Twenty-eighth Division, and Geddes's Detachment, on April 23, 1915. The severest fighting was on that part of the front held by the Third Brigade of Canadians. Many men had been killed or wounded in this brigade, and those who survived were ill from the effects of the gas. Furthermore, no food could be taken to them for twenty-four hours. Moreover, they were subjected to a fire from three sides, with the result that they were forced to a new position on a line running through St. Julien. Finally the Germans forced their way around to the left of the Third Brigade, establishing their machine guns behind it.