Accordingly Sir Douglas Haig, quick to realize that the events of the next few hours would decide the making or marring of the campaign, sent out an ultimatum to the effect that the line to which we had now been driven, _i.e._, from Gheluvelt to the corner of the canal north of Hollebeke, was to be held at all costs. Concurrently an urgent appeal was sent to General Allenby to send up with all possible speed any and all regiments available. Allenby sent the Scots Greys and the 3rd and 4th Hussars--all from different brigades. The Greys and the 3rd Hussars arrived first on the scene, and passed across to the left flank of the 6th C.B., filling up, in fact, the gap between that brigade and General Bulfin's (2nd) Brigade on its left. The 4th Hussars, who had further to come, arrived in time to take up a position on the right of the Royals (who were the right-hand regiment of the 6th C.B.), and carry on the line of defence beyond the railway. The position then was that the line of the three regiments of the 6th C.B. was extended by the 3rd Hussars and Greys on the left, and by the 4th Hussars on the right. The 7th C.B., who had concentrated at the little village of Zwartelen in rear of the 6th C.B., now sent off two squadrons of the Blues to support the Royals, who were holding the château at Hollebeke. This château lies on the low ground to the east of the canal, whereas Hollebeke itself is on the west side. The château was considerably in advance of the line which was ordered to be held, and with Zandvoorde gone was of no strategic importance. This combined force held off the enemy for some hours, during which time Sergt. McLellan, of the Royals, especially distinguished himself by several acts of great gallantry, but by midday the château had to be abandoned and was occupied by German infantry. Except for this loss, the cavalry line held its ground throughout the day. There was no further infantry attack, but it had to stand a severe shelling all through the afternoon, and its casualties were numerous, among those of the 10th Hussars being Captain Kinkead, Captain Fielden, Captain Stewart and the Hon. H. Baring. The R. Sussex, too, in General Bulfin's 2nd Brigade, on the left of the cavalry, came in for their full share of the bombardment and suffered very severely, Col. Crispin and Lieuts. Croft, Marillier and Lousada being killed. At five o'clock in the afternoon the five cavalry regiments were relieved by Lord Cavan's Brigade, the 2nd Grenadier Guards under Major Lord Bernard Lennox[11] taking over the position on the canal--later on to become famous under the name of Hill 60, while the Irish Guards continued the line on their left. The line was still further strengthened on the following morning by the addition of the Oxfordshire Light Infantry from the 5th Brigade, and the 2nd Gordon Highlanders from the 20th Brigade, these two battalions being added to General Bulfin's command, which was on the left of Lord Cavan's.