At 4-15 p.m. the 61st Brigade of the 20th Division, placed at the disposal of the 36th Division, was ordered to man the St. Simon defences, an arc covering the hairpin bend in the Canal de St. Quentin, and including the villages of Avesne and the Pont de Tugny. General Cochrane, commanding the Brigade, established headquarters at St. Simon.
The position on the right flank grew still more serious toward evening. Finally the Commander of the Fifth Army decided to withdraw the III. Corps behind the Canal de St. Quentin, in conformity with which move it was necessary for the 36th Division to be swung back also, pivoting upon the 1st Inniskillings, which battalion still clung to its Battle Zone. The 61st Brigade was ordered to withdraw across the Canal, obtaining touch on the right with the troops of the 14th Division, east of Avesne. From its left, half-way between Tugny and Artemps, the 108th Brigade was to hold up to the cemetery at Happencourt. Thence, up to and inclusive of Le Hamel, was to come the 107th Brigade. Then the 9th Inniskillings was to prolong the line to the Battle Zone defences of the 1st Inniskillings. The 61st Brigade was not to withdraw from the arc of the St. Simon bridgehead till the troops of the other Brigades had completed their retirement. When this had been effected, the 61st Brigade was to be in touch not only with the 108th, along the Canal, but with the 60th Brigade of its own Division, now at the disposal of the 30th Division, which had outposts on a line from the Canal south of Happencourt to Vaux, north of the Ham-St. Quentin Road.
The retirement began at 10-30 p.m., being covered by small rearguards. In the darkness the troops were not seriously pressed by the Germans. Long before dawn all battalions were established in their new positions, the three Brigade Headquarters of the 36th Division being at Lavesne, and that of the 61st Brigade in the old Divisional Headquarters at Ollézy. General Nugent had meanwhile transferred his headquarters to Estouilly, north of Ham. It must be remembered that each Brigade had by now had one battalion almost completely destroyed, and that the Battle Zone battalions were at an average strength of about two hundred and fifty men. There was an accretion in artillery strength. Two batteries, A/91st and C/91st, of the 20th Divisional Artillery, together with the 232nd Siege Battery, were put at the disposal of the 36th Division, and remained with it throughout the retreat, though there were constant changes in the formation of Groups. The Siege Battery was later transferred to a special Heavy Artillery Group, with two others, directly under the orders of the 36th Divisional Artillery.
The destruction of bridges and pontoons allotted to the Engineers of the 36th Division was carried through without hitch. Shortly after noon the pontoon and foot-bridge at Fontaine were destroyed by the 121st Field Company, which in the small hours of the 22nd of March blew up the whole group of bridges between Grand Séraucourt and Le Hamel. Later, in daylight, the 150th Field Company blew up the Artemps Group. The Tugny and St. Simon bridges had been allotted to other sections of the company. Lieutenants C. L. Knox and J. B. Stapylton-Smith were each responsible for twelve bridges. The first warning received by the former was when the débris of the Artemps bridges floated down-stream. He at once commenced his task. Several of the bridges were destroyed under machine-gun fire. At Tugny, the Germans were advancing on the main steel-girder bridge when the time-fuse failed. The night dew or the mist had spoiled it. As Lieutenant Knox rushed forward the foremost of the enemy were upon the bridge, a long one. He tore away the useless time-fuse, clambered under the frame-work of the bridge, and lit the instantaneous fuse. The bridge was destroyed, and, by some miracle, Lieutenant Knox was uninjured. He received the Victoria Cross. Among many heroic actions performed by officers and men of the Division in the course of the war it would be difficult to point to one of finer calibre. At St. Simon, Lieutenant Stapylton-Smith blew up a large number of the enemy with one of the three main bridges.
The early hours of March the 22nd, which dawned in thick mist like the day before, passed fairly quietly. For the moment, the right flank of the Division and the III. Corps on its right being behind the barrier of the Canal de St. Quentin, the greater pressure was shifted to the north. In bitter fighting the troops of the 1st Inniskillings held their ground in the forward positions of the Battle Zone, till 2 p.m., when, completely outflanked, they were ordered to withdraw to Ricardo Redoubt, the headquarters redoubt in the Battle Zone, upon which attack after attack was launched, to be beaten off with heavy losses by the defenders. The Germans across the Canal were meanwhile far in their rear, having batteries in Artemps by now. Finally, Ricardo Redoubt was surrounded, the 9th Inniskillings being compelled to fight a rearguard action back to the Happencourt-Fluquières Line, upon which, as has been recorded, were troops of the 60th Brigade. On the right the Canal Line held, though the enemy had brought up batteries, trench mortars, and machine-guns under cover of the mist, and was bombarding it heavily.
At noon General Nugent was informed that, in consequence of the decision of the Higher Command to hold the line of the Canal de la Somme and its continuation southward, the Canal de St. Quentin, a further withdrawal was necessary. The 36th Division, with the 61st Brigade attached, was now to hold this position from the present right flank of that Brigade to Sommette-Eaucourt. The 61st Brigade had already a battalion, the 7th D.C.L.I., holding from the Canal junction to a point west of the Dury-Ollézy Road, less one company, which had been moved down to the right flank to fill a gap between its right battalion, the 7th Somerset L.I., and the troops of the 14th Division. Its other battalion, the 12th King's, was driven out of Tugny at dusk by the advance of the enemy north of the Canal de St. Quentin, crossed the Canal de la Somme at Dury, and was withdrawn through the 7th D.C.L.I. to support on the railway behind that battalion. The withdrawal of the Brigades of the 36th Division was complete at 11 p.m., when the last troops passed through Pithon. The 108th Brigade took over the defence of the Canal bank from the left of the 7th D.C.L.I. to Sommette-Eaucourt. The 107th Brigade moved to Eaucourt and Cugny, the 109th to Brouchy in support. As no touch could be obtained with the 30th Division, which was to have prolonged the line westward, by the 108th Brigade, the 21st Entrenching Battalion, which had now come under General Nugent's orders, was put in on the left of the Brigade.
Ricardo Redoubt, in which the heroic resistance of Colonel Crawford's 1st Inniskillings continued all day, was now, of course, completely isolated. At three o'clock the commanding officer sent away a detachment, some men of which succeeded in making their way back to our lines. The remainder fought to the end. Finally driven to the north-western corner of the Redoubt, they ejected the enemy bombers who had now a footing there. Two men alone, Privates Bailey and Conway, drove out one group of the German bombers. Trench mortars pounded them from all sides, which they could not reach. A mere handful was taken prisoner with Colonel Crawford about 6 p.m. It is difficult to overestimate the value of this magnificent stand against overwhelming odds.
The position at two o'clock on the morning of March the 23rd may be summarized for the sake of clarity. The 36th Division, with attached troops, held the line of the Canal de St. Quentin and Canal de la Somme from a mile and a half north-west of Jussy to a mile west of Sommette-Eaucourt. Upon this line it had, from right to left, the 61st Brigade (7th Somerset L.I. on right, 7th D.C.L.I. on left, 12th King's in support); the 108th Brigade (9th Irish Fusiliers on right, 1st Irish Fusiliers on left; with a composite battalion of details and men returned from courses finding the outposts, to allow some rest to the other battalions); 21st Entrenching Battalion. The length of the front was upwards of five miles. The 16th Rifles (Pioneers) was at Sommette-Eaucourt, where the battalion had been working since before noon on a line of strong points. The 109th Brigade, consisting now of the 9th Inniskillings, was at Brouchy, in reserve. The 107th Brigade Headquarters and the 2nd Irish Rifles were at Cugny. The other battalion of this Brigade, the 1st Rifles, now very weak, was at Eaucourt. Divisional Headquarters were at Fréniches.