The First Battle of Dernancourt was fought on 28 March 1918 near Dernancourt in northern France during World War I. It involved a force of the German 2nd Army attacking elements of the VII Corps, which included British and Australian troops, and resulted in a complete defeat of the German assault.

The Australian 3rd and 4th Divisions had been sent south from Belgium to help stem the tide of the German spring offensive towards Amiens and, with the British 35th Division, they held a line west and north of the Ancre river and the area between the Ancre and Somme, forming the southern flank of the Third Army. Much of the VII Corps front line consisted of a series of posts strung out along a railway embankment between Albert and Buire-sur-l'Ancre. The main German assault force was the 50th Reserve Division of the XXIII Reserve Corps, which concentrated its assault on the line between Albert and Dernancourt, attacking off the line of march after a short artillery preparation. Supporting attacks were to be launched by the 13th Division further west. Some German commanders considered success unlikely unless the embankment was weakly held, and the commander of the German 2nd Army ordered the attack to be postponed, but that message did not reach the assaulting troops in time.

The Germans attacked at dawn under the cover of fog, but other than one small penetration by a company in the early morning that was quickly repelled, partly due to the actions of Sergeant Stanley McDougall of the Australian 47th Battalion, the Germans failed to break through the VII Corps defences. McDougall was awarded the Victoria Cross, the highest award that could be received by an Australian soldier for gallantry in the face of the enemy. By late afternoon, rain set in, making early renewal of the assault less likely. The Germans suffered about 550 casualties during the battle, and the Australians lost at least 137 killed or wounded. The British 35th Division suffered 1,540 casualties from 25 to 30 March. In the week following the battle, the Germans renewed their attempts to advance in the sector, culminating in the Second Battle of Dernancourt on 5April, when the Germans were defeated in desperate fighting.

Background After the Third Battle of Ypres petered out in late 1917, the Western Front fell into its usual lull over the winter months. In early 1918, it became apparent to the Allies that a large German offensive was pending. This German spring offensive commenced on 21 March 1918, with over one million men in three German armies striking hard just north of the junction between the French and British armies. The main effort of this offensive hit the British Third and Fifth Armies, which formed the right flank of the British front line. Struck a series of staggering blows, a breach between the two British armies developed, and they were forced into a rapid, and in parts disorganised withdrawal, suffering heavy losses. The key railway junction at Amiens was soon threatened.

Shortly after the Spring Offensive began, the Australian 3rd and 4th Divisions were deployed south in stages from rest areas in the Flanders region of Belgium to the Somme river valley in France to help stem the German offensive. Initially it was intended to use them to launch a counter-offensive, but this idea was soon shelved due to German successes. On their way south, the 4th Brigade was detached from the 4th Division to help halt the Germans near Hébuterne in the centre of the Third Army sector. Travelling by train, bus and marching on foot, the remaining two brigades of the 4th Division, the 12th and 13th Brigades, concentrated in the area west of Dernancourt, under the command of the VII Corps led by Lieutenant General Walter Congreve, which now formed the right flank of the Third Army.

The commander of the 4th Division, Major General Ewen Sinclair-Maclagan, was ordered to support and then relieve remnants of the 9th (Scottish) Division, which was holding the front line along a railway between Albert and Dernancourt, west of the Ancre river. This task was given to the 12th Brigade, under the command of Brigadier General John Gellibrand. The 13th Brigade was held in support positions between Bresle and Ribemont-sur-Ancre. To the right of the 12th Brigade was the British 35th Division, positioned between Dernancourt and Buire-sur-l'Ancre, and commanded by Brigadier General Arthur Marindin. That division had been involved in a series of fighting withdrawals since being committed to battle on 25 March near Cléry-sur-Somme, some east of Dernancourt. The 3rd Division, commanded by Major General John Monash, was deployed further to the south, between the Ancre and the Somme around Morlancourt, with its 10th Brigade to the right of the 35th Division.

Preparations VII Corps dispositions

From before midnight on 27 March, the now tired 12th Brigade had been holding the railway line between Albert and Dernancourt, having relieved the 9th (Scottish) Division. The forward positions of the salient held by the 12th Brigade were along the railway line, which ran along a series of embankments and cuttings, up to but not including a railway bridge immediately northwest of Dernancourt where the Dernancourt–Laviéville road passed under the railway. Northwest of Dernancourt, a mushroom-shaped feature known as the Laviéville Heights overlooked the railway line, which curved around its foot. This was difficult ground to defend, particularly where the railway line curved and skirted the northwestern corner of Dernancourt, as the outskirts of the village were very close to the railway line at this point, and provided good concealment for approaching enemy troops. If the line there was overrun, the enemy would be able to fire into the rear of the troops deployed along the railway in both directions. Despite this, the Australian commanders considered it important to hold the railway line; if it was not garrisoned, the enemy could assemble in the dead ground behind the embankment. A further difficulty arose from the fact that if an attack occurred during daylight, it would be almost impossible to move troops down the exposed slopes to reinforce the railway line without crippling losses, and troops withdrawing from the railway line would be similarly exposed. To afford them some protection along the railway line, the forward posts dug one-man niches in the near side of the embankment, but the only way for them to fire was to climb up and lie on top of the embankment, thus exposing themselves to enemy fire.

On the left of the brigade front, with its northern flank short of the Albert–Amiens road, was the 48th Battalion, commanded by Lieutenant Colonel Raymond Leane. To its left was the British 12th (Eastern) Division of V Corps. The 48th Battalion was holding its sector with two companies in a series of posts along alternate cuttings and embankments of the railway line as it ran south from Albert. Close to that town the railway line was not in VII Corps hands, and the posts were thrown back along the side of a gully short of the Albert–Amiens road, in contact with the southern posts of the 12th (Eastern) Division, which extended south of the road at this point. The battalion frontage was about . The 48th Battalion support line was located about to the rear on the high ground, astride the Albert–Amiens road. Due to the curvature of the slope, the two companies in the support line were out of sight of its forward companies at the railway line.

On the right of the 48th Battalion was the 47th Battalion, commanded by Lieutenant Colonel Alexander Imlay, with its two forward companies also strung out along the railway line. The total frontage of the 47th Battalion was , which meant that the 180–200 men of the forward companies were positioned in widely spaced posts. Between the forward companies was a section of embankment near a level crossing which was not garrisoned, but was covered from a shallow cutting to the south and a low embankment to the north. The 47th Battalion's support line was also located on the hill some distance to the rear. The 12th Machine Gun Company was deployed with eight of its Vickers machine guns in each battalion area, mainly sited along the railway line. Leane and Imlay had their headquarters co-located on the summit next to the Albert–Amiens road. Of the two remaining battalions of the 12th Brigade, the 45th Battalion was deployed on the slope behind the 106th Brigade of the 35th Division, and the 46th Battalion was held in reserve near the village of Millencourt.

On the right of the 12th Brigade were elements of the 35th Division, the first of these was the 19th (Service) Battalion (2nd Tyneside Pioneers) of the Northumberland Fusiliers (19th NF), commanded by Lieutenant Colonel W.P.S.Foord. It was deployed near the railway arch on the northwestern outskirts of Dernancourt. The right-hand gun of the 12th Machine Gun Company was positioned with this unit, which was under the control of the 106th Brigade. To their right the 106th Brigade was deployed along the railway line as far as Buire-sur-l'Ancre, the front line there being held by the 17th (Service) Battalion, Royal Scots, and the 12th (Service) Battalion, Highland Light Infantry. This section of the railway ran along flat ground. On its right, the 104th Brigade line ran from Buire-sur-l'Ancre past Treux, its forward battalions being the 18th (Service) Battalion (2nd South East Lancashire) of the Lancashire Fusiliers, and the 19th (Service) Battalion, Durham Light Infantry. The 104th Brigade overlapped and sheltered the left flank of the 10th Brigade of the 3rd Division, which was deployed just east of Méricourt-l'Abbé. The VII Corps positions had excellent observation of the surrounding countryside, but were tactically weak.

A significant amount of artillery support was available to the defenders. The divisional artillery of the 4th Division, consisting of the 10th and 11th Australian Field Artillery (AFA) Brigades, were within range, as were the British 50th and 65th Royal Field Artillery (RFA) Brigades. The S.O.S. lines of the 10th AFA Brigade were on a copse south of Albert, ahead of the 48th Battalion and those of the 11th AFA Brigade were on the far side of Dernancourt. The Australian batteries were in the open, as pits had not yet been dug for them due to their recent arrival.

German plan of attack

The main German attack was to be made by the 50th Reserve Division of General der Infanterie Hugo von Kathen's XXIII Reserve Corps. The 50th Reserve Division was a Prussian division that had been involved in the Spring Offensive from the outset. It had a few days' rest before the advance was delayed by the British at Albert and Dernancourt and its morale was still high. The right prong of the attack would be made by the 229th Reserve Infantry Regiment (RIR) advancing through the 9th Reserve Division north of Dernancourt against the sector held by the 48th Battalion. The left prong would consist of the 230th RIR, advancing from the area of Morlancourt through Dernancourt against the 47th Battalion and 19th NF. In this sector, I Battalion of the 230th RIR (I/230 RIR) would cross the Ancre and seize Dernancourt, then III Battalion, 230 RIR (III/230 RIR) would assault the embankment. After the capture of the embankment, the assaulting troops would push northwest over the Albert–Amiens road, then advance west towards Amiens. II Battalion, 230 RIR (II/230 RIR) was to follow up the assault of III/230 RIR. Both regimental commanders considered that the plan could succeed only if the embankment was weakly held and made representations to their brigade commander, to no avail. The German artillery preparation was to last only 45 minutes.