Battle of St. Quentin, 21–23 March

Day 1, 21 March

The artillery bombardment began at 04:35 with an intensive German barrage opened on British positions south west of St. Quentin for a depth of 4–6 km (2.5–3.7 mi). At 04:40 a heavy German barrage began along a 60 km (40 mi) front. Trench mortars, mustard gas, chlorine gas, tear gas and smoke canisters were concentrated on the forward trenches, while heavy artillery bombarded rear areas to destroy Allied artillery and supply lines. Over 3,500,000 shells were fired in five hours, hitting targets over an area of 400 km2 (150 sq mi) in the biggest barrage of the war, against the Fifth Army, most of the front of Third Army and some of the front of the First Army to the north. The front line was badly damaged and communications were cut with the Rear Zone, which was severely disrupted.

When the infantry assault began at 09:40, the GermanThe German Empire, also referred to as Imperial Germany, the Second Reich, as well as simply Germany, was the period of the German Reich from the unification of Germany in 1871 until the November Revolution in 1918, when the German Reich changed its form of government from a monarchy to a republic. During its 47 years of existence, the German Empire became the industrial, technological, and scientific giant of Europe. German infantry had mixed success; the German 17th and 2nd Armies were unable to penetrate the Battle Zone on the first day but the 18th Army advanced further and reached its objectives. Dawn broke to reveal a heavy morning mist. By 05:00, visibility was barely 10 m (10 yd) in places and the fog was extremely slow to dissipate throughout the morning. The fog and smoke from the bombardment made visibility poor throughout the day, allowing the German infantry to infiltrate deep behind the BritishThe British Empire, was composed of the dominions, colonies, protectorates, mandates, and other territories ruled or administered by the United Kingdom and its predecessor states. At its height it was the largest empire in history and, for over a century, was the foremost global power. By the start of the 20th century, Germany and the United States had begun to challenge Britain's economic lead. British front positions undetected. Much of the Forward Zone fell during the morning as communication failed; telephone wires were cut and runners struggled to find their way through the dense fog and heavy shelling. Headquarters were cut off and unable to influence the battle.

Around midday German troops broke through south-west of St. Quentin, reached the Battle Zone and by 14:30 were nearly 3 km (1.9 mi) south of Essigny. Gough kept in contact with the corps commanders by telephone until 15:00 then visited them in turn. At the III Corps Headquarters ("HQ"), he authorised a withdrawal behind the Crozat canal, at the XVIII Corps HQ he was briefed that the Battle Zone was intact and at the XIX Corps HQ found that the Forward Zone on each flank had been captured. Gough ordered that ground was to be held for as long as possible but that the left flank was to be withdrawn, to maintain touch with the VII Corps. The 50th Division was ordered forward as a reinforcement for the next day. On the VII Corps front, Ronssoy had been captured and the 39th Division was being brought forward; on the rest of the front, the 21st and 9th divisions were maintaining their positions and had preserved the link with V Corps of the Third Army in the Flesquières Salient to the north. The Fifth Army "Forward Zone", was the only area where the defences had been completed and had been captured. Most of the troops in the zone were taken prisoner by the Germans who moved up unseen in the fog; garrisons in the various keeps and redoubts had been surrounded. Many parties inflicted heavy losses on the Germans, despite attacks on their trenches with flame throwers. Some surrounded units surrendered once cut off, after running out of ammunition and having had many casualties; others fought to the last man.

In the Third Army area, German troops broke through during the morning, along the Cambrai–Bapaume road in the Boursies–Louverval area and through the weak defences of the 59th Division near Bullecourt. By the close of the day, the Germans had broken through the British Forward Zone and entered the Battle Zone on most of the attack front and had advanced through the Battle Zone, on the right flank of the Fifth Army, from Tergnier on the Oise river to Seraucourt-le-Grand. South-west of St. Quentin in the 36th Division area, the 9th Irish Fusiliers war diary record noted that there had been many casualties, three battalions of the Forward Zone had been lost and three battalions in the Battle Zone were reduced to 250 men each, leaving only the three reserve battalions relatively intact. Casualties in the division from 21–27 March were 6,109, the most costly day being 21 March.

Gough had been forced to order a fighting retreat to win time for reinforcements to reach his army. As the British fell back, troops in the redoubts fought on, in the hope that they would be relieved by counter-attacks or to impose the maximum delay on the German attackers. The right wing of the Third Army also retreated, to avoid being outflanked. The morning fog had delayed the use of aircraft but by the end of the day, 36 squadrons of the Royal Flying Corps had been in action and reported losing 16 aircraft and crew, while having shot down 14 German aircraft; German records show 19 and 8 losses. The first day of the battle had been costly for the Germans, who had suffered c. 40,000 casualties, slightly more than they inflicted on the BEF. The attack in the north had failed to isolate the Flesquières Salient, which had been held by the 63rd Division and the weight of the German offensive was increased in the south, where the 18th Army received six fresh divisions.

Day 2, 22 March

On the second day of the offensive, British troops continued to fall back, losing their last footholds on the original front line. Thick fog impeded operations and did not disperse until early afternoon. Isolated engagements took place as the Germans pressed forward and the British held their posts, often not knowing who was to either side of them. Brigade and battalion control over events was absent. It was a day of stubborn and often heroic actions by platoons, sections and even individuals isolated from their comrades by the fragmented nature of the battle and lack of visibility. The greatest danger facing the British on 22 March was that the Third and Fifth armies might become separated. Byng did not order a retirement from the Flesquières salient, which his army had won at such cost and Haig ordered him to keep in contact with the Fifth Army, even if that required a further retreat; the day also saw the first FrenchFrench Third Republic was the system of government adopted in France from 4 September 1870, when the Second French Empire collapsed during the Franco-Prussian War, until 10 July 1940, after the Fall of France during World War II led to the formation of the Vichy government. During the 19th and 20th centuries, the French colonial empire was the second largest colonial empire in the world only behind the British Empire. French troops enter the battle on the southern flank.

Small parties of British troops fought delaying actions, to allow those to their rear to reach new defensive positions. Some British battalions continued to resist in the Battle Zone and delay the German advance, even managing to withdraw at the last moment. At l'Épine de Dallon the 2nd Wiltshire battalion held out until 14:30 and at "Manchester Hill", the garrison of the 16th Manchesters commanded by Lieutenant-Colonel Wilfrith Elstob, fought until he was killed at 16:30. Directly to their rear was the "Stevens Redoubt", of the 2nd Battalion of the Bedfordshire Regiment, to which the survivors retired. The redoubt was reinforced by two companies of the 18th King's and attacked from all sides after the units on the flanks had been pushed back. The Bedfords were ordered to retire just as their ammunition ran out and retreated through the lines of the 20th Division, having lost half their number.

The longest retreat was made in the XVIII Corps area, where the corps commander General Ivor Maxse, appeared to have misinterpreted an order from Gough for a fighting retreat if necessary, to mean that the corps should fall back to the Somme. The Germans brought heavy artillery into Artemps under the cover of the morning mist, which forced the remaining battalions of the 109th Brigade (36th Division) to retreat to join the 108th Brigade at Happencourt. The result of the misunderstanding between Gough and Maxse and different interpretations placed on telephone messages and written orders, was that the 36th Division retired to Sommette-Eaucourt on the south bank of the Canal de Saint-Quentin, to form a new line of defence. This required the Division to cross the Canal at Dury. The daylight withdrawal to the Green Line, over almost 14 km (9 mi), was completed gradually, assisted by the defence of the Ricardo Redoubt whose garrison did not surrender until 16:40. During the retreat, Engineers blew the bridges across the Canal between Ham and Ollézy but the railway bridge at Pithon suffered only minor damage. The Germans were soon over the river and advanced up to 15 kilometres (10 mi) to the Crozat canal.

Day 3, 23 March

Early on the morning of Saturday 23 March, German troops broke through the line in the 14th Division sector on the Canal de Saint-Quentin at Jussy. The 54th Brigade were holding the line directly to their south and were initially unaware of their predicament, as they were unknowingly being outflanked and surrounded. The 54th Brigade History records "the weather still favoured the Germans. Fog was thick over the rivers, canals and little valleys, so that he could bring up fresh masses of troops unseen". In the confusion, Brigade HQ tried to establish what was happening around Jussy and by late morning the British were retreating in front of German troops who had crossed the Crozat Canal at many points. All lines of defence had been overrun and there was nothing left to stop the German advance; during the day Aubigny, Brouchy, Cugny and Eaucourt fell.

Lieutenant Alfred Herring of the 6th Northamptonshire Battalion in the 54th Brigade, despite having never been in battle before, led a small and untried platoon as part of a counter-attack made by three companies, against German troops who had captured the Montagne Bridge on the Crozat Canal. The bridge was recaptured and held for twelve hours before Herring was captured with the remnants of his platoon.

The remnants of the 1/1st Hertfordshire Regiment were retreating across the southernmost edges of the 1916 Somme battlefield and by the morning of 24 March there were only eight officers and around 450 men left. The war diary read,

Before dawn the Bn marched to BUSSU and dug in hastily on the east side of the village. When both flanks became exposed the Bn retired to a line of trenches covering the PERONNE–NURLU road. After covering the 4/5th Black Watch Regt on the left the Bn withdrew to the ST. DENNIS line which was very stubbornly defended. The Bn then retired with difficulty to the line protecting the PERONNE–CLERY road with the remainder of the 116th Inf. Bde. to cover the retreat of the 117th and 118th Inf. Bdes. When this had been successfully accomplished under very harassing machine gun fire from the enemy, the Bn conformed to the general retirement on CLERY village where it concentrated. The remnants of the Bn then defended a line of trenches between the village and running down to the River SOMME.”(23 March 1918).

Ludendorff issued a directive for the "continuation of the operations as soon as the line Bapaume–Peronne–Ham had been reached: 17th Army will vigorously attack in the direction Arras–St Pol, left wing on Miraumont (7 km (4 1⁄2 mi) west of Bapaume). 2nd Army will take Miraumont–Lihons (near Chaulnes) as direction of advance. 18th Army, echeloned, will take Chaulnes–Noyon as direction of advance, and will send strong forces via Ham". The 17th Army was to roll-up British forces northwards and the 2nd Army was to attack west along the Somme, towards the vital railway centre of Amiens. The 18th Army was to head south-west, destroying French reinforcements on their line of march and threatening the approaches to Paris in the Second Battle of Picardy (2e Bataille de Picardie). The advance had been costly and the German infantry were beginning to show signs of exhaustion; transport difficulties had emerged, supplies and much heavy artillery lagged behind the advance.

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