The German attack upon the British lines by the army of General von Quast in Flanders broke on the morning of April 9. There had been considerable shelling on the day before along the whole line, but as the hour approached this concentrated with most extreme violence on the nine-mile stretch from the village of Givenchy in the south to Fleurbaix, which is just south of Armentières in the north. This proved to be the area of the actual attack, and against this front some eight German divisions advanced about 6 o'clock of a misty morning. So shattering had been their bombardment and so active their wire-cutters, who were covered by the fog, that the advanced positions could hardly be said to exist, and they were able to storm their way at once into the main defences.

The point upon which this attack fell was held the by four divisions, all of which formed part of Horne's First Army. The general distribution of the troops at that time was that the Second Army stretched from the junction with the Belgians near Houthulst Forest down to the Messines district where it joined the First Army. The First Army had weakened itself by an extension to the south, and Plumer's force was about to extend also, and take over the Laventie district, when the storm suddenly burst upon the very point which was to be changed.

Two corps were involved in the attack, the Fifteenth (De Lisle) in the Armentières region, and the Eleventh (Haking) in the region of Givenchy. The latter had two divisions in the line, Jeudwine's Fifty-fifth West Lancashire Territorials defending the village and adjacent lines, while the Portuguese Second Division (Da Costa) covered the sector upon their left. The depleted Fiftieth Division (Jackson) was in immediate reserve. On the left of the Portuguese was Ponsonby's Fortieth Division which had lost five thousand men in the Somme battle only a fortnight before, and now found itself plunged once more into one of the fiercest engagements of the war, where it was exposed again to very heavy losses.

The main force of the German attack fell upon the Portuguese line, and it was of such strength that no blame can be attached to inexperienced troops who gave way before so terrific a blow, which would have been formidable to any soldiers in the world. The division held the line from 2000 yards south of Richebourg l'Avoué to the east of Picantin, a frontage of 9350 yards, or more than half of the total front of the assault. The division had all three brigades in the line, and even so was very extended to meet a serious assault. The 3rd Brigade from the First Portuguese Division was in immediate support. The 5th Brigade was on the right, covering Le Touret, the 6th in the middle, and the 4th on the left, covering Laventie. Behind the whole position lay the curve of the River Lys, a sluggish stream which moves slowly through this desolate plain, the Golgotha where so many men have died, Indians, French, British, and German, since the first months of the war. In all that huge flat canalised space it was only at Givenchy that some small ridge showed above the dreary expanse.

The Portuguese had been in the line for some months, but had never experienced anything to approach the severity of the shattering bombardment which poured upon them from four in the morning. When an hour or two later the storming columns of the German infantry loomed through the thick curtain of mist, the survivors were in no condition to stand such an attack. All telephone and telegraph wires had been cut within the first half-hour, and it was impossible to direct any protective barrage. The artillery in the rear, both British and Portuguese, had been much weakened by a concentration of gas-shells extending as far as Merville, so that the infantry were left with insufficient support. The gunners stood to their work like men, and groups of them continued to fire their guns after the infantry had left them exposed. These brave men were killed or captured by the enemy, and their batteries were taken. In the rear the roads had been so shattered by the German fire that it was impossible to get a tractor or lorry up to the heavy guns, and there was no way of removing them. All observers agree that the crews of the heavy guns did excellently well. The whole front had fallen in, however, and in spite of scattered groups of infantry who showed the traditional Portuguese courage—that courage which had caused the great Duke to place them amongst his best soldiers—the position was in the hands of the enemy. By mid-day they were at Le Touret upon the right, and the guns there were blown up and abandoned. About the same time they had reached Estaires upon the left and Bout Deville in the centre. Before evening the German line was four miles from its starting-point, and had reached the River Lawe, a small affluent of the Lys. From this time onwards the Fiftieth Division, coming up from the rear, had taken over the front, and the Portuguese were out of the battle. The Germans in their day's work had taken 6000 prisoners and 100 guns, many of them in ruins. It should be mentioned that the Portuguese ordeal was the more severe, as breast-works had taken the place of trenches in this sector. All were agreed that General da Costa did what was possible. "He is a fine man, who does not know what fear is," said a British officer who was with him on the day of the battle.

The caving in of the front of the line had a most serious effect upon the two British divisions, the Fifty-fifth and the Fortieth, who were respectively upon the right and the left of the Portuguese. Each was attacked in front, and each was turned upon the flank and rear. We shall first consider the case of the Fifty-fifth Division which defended the lines of Givenchy with an energy and success which makes this feat one of the outstanding incidents of the campaign. This fine division of West Lancashire Territorials, containing several battalions from Liverpool, had some scores to settle with the Germans, by whom they had been overrun in the surprise at Cambrai at the end of the last November. At Givenchy they had their glorious revenge.

The position of the Fifty-fifth Division was a strong one, extending for some thousands of yards from the hamlet of Le Plantin in the south to Cailloux in the north, with a section of the old British line a thousand yards in front, a deserted trench half full of water and festooned with rusty wire. There were outpost companies along the scattered line of ruined houses, and a few posts were thrown far out near the old trench. The village line consisted of a series of well-concealed breast-works and loopholed walls without any continuous trench, the whole so cunningly arranged that it was difficult to get the plan of it from in front. Each post or small fort had its own independent scheme of defence, with good enfilade fire, concrete emplacements, belts of wire, and deep ditches.

Very early in the day the left flank of the position had been entirely exposed by the retirement of the Portuguese, so that during the whole long and desperate struggle the general formation of the division was in the shape of an L, the shorter arm being their proper front, and the longer one facing north and holding up the German attack from inside the old lines. The northern defensive flank does not seem to have been entirely improvised, as some precautions of this nature had already been taken. The new front extended from the hamlet of Loisne upon the stream of that name, through a second hamlet called Le Plantin, and so down to the canal. The first strain of the fighting fell chiefly upon the 165th Brigade (Boyd-Moss), consisting of three battalions of the famous King's Liverpool Regiment. The 6th and 7th Battalions were in the line with the 5th in support at Gorre, but as the day wore on and the pressure increased, units from both the other brigades were drawn into the fight, so that all participated in the glory of the victory. By 8.30 the flank was entirely naked, and the Germans in small but audacious bodies, with a constant rattle of rifle and machine-gun fire, were pushing in between the outer posts of the British division, overwhelming and obliterating some of them by a concentrated fire of trench mortars. Some of these isolated garrisons held out in the most desperate fashion, and helped to take the pressure off the main village line. One particularly brilliant example was that of Captain Armstrong of the 1/4th South Lancashires, who with A Company of that battalion defended a moated farm, literally to the death, having been warned that it was a key position.

About mid-day the German attack was still creeping in, and had gained one important outpost called Princes' Island. The 10th Liverpool Scots from the 166th Brigade, a battalion which has a great record for the war, had come up to thicken the line of defenders. Amid the crash and roar of constant shells, and a storm of bullets which beat like hail upon every wall and buzzed through every crevice, the stubborn infantry endured their losses with stoic patience, firing steadily through their shattered loopholes at any mark they could see. At 1 o'clock some audacious stormers had got so far forward on the left that they were in the rear of the Brigade Headquarters, and were only held there by spare men from the transport lines who chanced to be available. The attack was drifting down more and more from the new ground, so about this hour the 5th South Lancashires, also of the 166th Brigade, were sent across to the north of Loisne to hold the stream. Each flank was attempted in turn by the wily assailants, so that when the left proved impervious they charged in upon the right, and captured Windy Corner, which is near the canal upon that side, continuing their advance by attacking Le Plantin South from the rear and the flank, so that the defenders were in an impossible position. Having taken this point it seemed as if the Germans would roll up the whole long thin line from the end, and they actually did so, as far as Le Plantin North. Here the British rallied, and the survivors of the 6th and 7th King's made a furious advance, pushed the Germans back, retook Le Plantin South, and captured a number of prisoners. The position was still serious, however, as the Germans held Windy Corner, and had penetrated between the British right and the canal, so as to get into the rear of the position. A great effort was called for, and the men responded like heroes. The 2/5th Lancashire Fusiliers from the 164th Brigade (Stockwell) had come up, and these fine soldiers, with the weary remains of the two King's Liverpool battalions, rushed the whole German position, dragging them out from the pockets and ruins amid which they lurked. In this splendid counter-attack more than 700 prisoners were taken in all, with a number of machine-guns. At the end of it the British right was absolutely intact.