Pétain and his staff drafted a new artillery programme and it was disseminated in May 1916. The roles assigned to each type of artillery and their proportions were adjusted in recognition of the new realities revealed by the battles around Verdun. Divisions gained additional medium howitzers while all the 155mm howitzers and heavier, bunker-busting mortars went into the corps and army artillery groupes. Once again it was the Second Army’s training pamphlet that was circulated to the entire army as accepted doctrine, outlining advances in support, counter-preparation, communications, liaison, counter-battery techniques and the rapid concentration of fire from dispersed batteries. Pétain also set up a Centre of Artillery Studies to coordinate research into new technologies, techniques and doctrines and to disseminate the most effective approaches to artillery operations. The new programme changed production schedules and increased the French artillery regiments from 115 to 247: a radical increase in dedicated manpower at the very point at which the French were beginning to run out of fresh reserves.
Pétain took a personal interest in the activities of his hard-pressed gunners and often started meetings by asking corps liaison officers ‘What have your batteries being doing? We’ll discuss other points later.’ Coordination was to be their new watchword and they were instructed to ‘give the infantry the impression that [the artillery] is supporting them and that it is not dominated’. Such a policy increased artillery casualties but heartened the infantry, who were increasingly seeing the artillerymen as rear-area troops who had found a way to avoid genuine combat. One of the key innovations was the artillery offensive, a series of coordinated artillery raids on rear areas designed to disrupt movement and cause casualties. The Germans quickly noted the effectiveness of such tactics, observing that the French ‘began the flanking fire on the ravines and roads north of Douaumont that was to cause us such severe casualties’.
Even antiquated guns could make an impression if properly sited and, as noted above, the obsolete 155s placed to flank any German assault on the right bank of the Meuse inflicted horrific casualties during VII Korps’ attempts to breach that sector during March. The French guns were concealed among the fortress lines on the Bois Bourrus ridge and there was nothing that General von Zwehl’s gunners could do to prevent the French from slaughtering his men. The wounded streaming back to their start lines were described as ‘a vision of hell’ by one commander while another officer shouted ‘What … battalion? Is there such a thing!’
The next series of attacks focused on the left bank of the Meuse, centring on the grim slopes of the all-too-appropriately-named hill, Le Morte Homme. The terrain gave the attacking infantry considerable cover but the complex topography also favoured aggressive counter-attacks and the entire region was soon covered with blackened craters – one airman described the Verdun sector as appearing like ‘the humid skin of a monstrous toad’. The German preparatory bombardments were horrifying and one description of an attack on Côte 304 creates a strong impression of both the improvements to artillery preparation being made by the Germans and the stubborn tenacity of their Gallic opponents:
The pounding was continuous and terrifying. We had never experienced its like during the whole campaign. The earth around us quaked, and we were lifted and tossed about. Shells of all calibres kept raining on our sector. The trench no longer existed; it had been filled up with earth. We were crouching in shell-holes, where the mud thrown up by each new explosion covered us more and more. The air was unbreathable. Our blinded, wounded, crawling and shouting soldiers kept falling on top of us and died while splashing us with their blood. It really was a living hell. How could one ever survive such moments? We were deafened, dizzy and sick at heart. It is hard to imagine the torture we endured: our parched throats burned, we were thirsty, and the bombardment seemed endless …
Pétain’s new system was based upon building up a detailed record of all enemy artillery missions and battery locations and then centrally co-ordinating his forces to maximise his own guns’ disruption and destruction. Petain ensured that units spent only a few days in the front line before being relieved, the noria system, and this combination of fire-power and a realistic understanding of what the infantry could withstand gave the French the edge they needed. The army buckled but it did not collapse, even after the Germans launched eight frontal attacks on the defensive system around the heroic stronghold of Fort Vaux, finally taking its exhausted and parched garrison on 7 June. Undaunted, the Germans experimented with creating artillery corridors for assaults and the French found these extremely frustrating as it was difficult to predict the objective and resist the concentration of firepower. As Pétain noted, ‘In effect, ignorant of the points threatened by attack, the defenders are obliged to be strong everywhere and to place in the front line increased numbers of personnel who must be replaced often.’ While the new tactic was successful in increasing French casualties, it could not win the battle without forming part of a wider operational plan; it proved to be yet another example of the Germans’ inability to use their advanced tactics to achieve strategic objectives. In contrast, they ignored French logistics and throughout the battle ammunition and reinforcements flowed up the road from Bar-le–Duc to Verdun, endless lines of soldiers and 2, 000 tonnes of ammunition a day moving towards ‘the everlasting rumble of the guns’. For reasons that are still difficult to understand, neither the German artillery batteries nor the Luftstreitkräfte made a concerted effort to cut this vital artery and thus doomed both sides to a level of attrition that drained the fighting power of both armies.
Pétain, ‘the master of scientific tactics’, was promoted to command Army Group Centre in June and Robert Nivelle took over the defence of Verdun, ‘the kingdom of the guns’. A new German offensive, led by the elite Alpenkorps and supported by a three-day bombardment that utilised large quantities of phosgene (a new asphyxiating gas), understandably described by Mangin as ‘the most important and most massive attack that Verdun had to withstand’, greeted Nivelle’s appointment but the French artillery had reorganised and restructured since February. The precise German timetable of fire-missions and assaults that had worked so effectively in February fell apart in the face of a devastating series of counter-barrages that enabled French counter-attacks to retake all the key points. Another offensive in July ran straight into Mangin’s veteran gunners and was pushed back to its start line by a series of savage counter-attacks. Verdun had become an open ulcer that threatened to swallow Germans as fast as it slaughtered Frenchmen. The German phase of the battle had ground to a halt and now the French could demonstrate what they had learned in the first six months of fighting.
It would take time to fully reorganise the French army to suit Pétain’s vision of total war but most of the key concepts would be in place when their primary creator was placed in supreme command. The proof came when Nivelle and Mangin finally launched a successful attack to retake Fort Douaumont, after a number of costly but instructive failures, overwhelming the battered fortress with relentless fire from super-heavy guns – including two 400mm pieces which Joffre brusquely dismissed as being ‘chiefly for the diversion of the public and the press’. Nivelle dedicated enormous resources to the assault and a number of innovations helped the advancing French infantry. Every unit was thoroughly briefed on their objectives, a creeping barrage was used to keep the defenders under cover until the assault was on top of them and all communication wires were laid in 6-ft deep trenches to ensure continuous communications. The barrage moved 100 yards every 4 minutes, the 75s firing a hail of shrapnel only 70 yards ahead of the advancing infantry and the 400 heavy guns methodically pulverising the line with high explosive another 80 yards further forwards.
The supremely confident Mangin, described by one observer as literally licking his lips in anticipation, even briefed Allied journalists on the morning of the attack:
My 75s will engage the Boche trenches and I have an abundance of large calibre shells to smash every shelter … At H-hour, in two hours, the infantry will leave their own trenches and take the trenches before them; preceding them, at a distance of 70 or 80 metres, will be a blanket of 75 shells … When the creeping barrage catches up with it, the heavies will shift targets and hammer the reserves … We will continue towards the [German] reserves using the same method and they will be beaten by our troops … It will be an affair of at most a few hours …
One officer saw the lines of guns being deployed and understandably snarled at the belated arrival of France’s full military potential: ‘If only we had been thus provided at the beginning of the war, we should not now be fighting in France.’
Mangin ordered a continuous preparatory bombardment to prevent the Germans from improving their defences, a process he gleefully described as ‘not burying the hatchet’ and the Germans assumed that the French intended a series of localised attacks. One French unit even withdrew to avoid being hit by any shorts from their own side during the massive barrage and some audacious Mecklenburgers on the other side of no-man’s-land had the audacity to dash over and take cover in the abandoned French front line! The larger guns focused on Douaumont itself and as the 400mm shells began to smash into the fort’s already shattered carapace, the German garrison withdrew to the interior – then, after the water was exhausted, all but a few men abandoned the fortress entirely.
The bombardment started on 15 December and lasted three days; when the French guns at last fell silent the Germans emerged from their stollen and dashed to their assigned positions just as their own guns commenced counter-preparatory fire. To the amazement of the front-line infantry, there were no enemy troops in sight – but then Nivelle’s reserve of heavy guns commenced counter-battery fire against the freshly unmasked German batteries. The French 155mm guns pounded the German positions for an additional 36 hours, silencing or destroying 68 of the 158 batteries, before the creeping barrage began its relentless progress towards the main French objectives. The stunned Germans were completely over-whelmed as the French emerged from the morning mist and poured across the shell-scarred landscape, seizing positions that both sides had bitterly contested for months. In the foggy chaos Mangin and his staff soon lost contact with the assault regiments – a foretaste of disasters to come – but the key objectives were taken. French casualties were higher than hoped but the defenders suffered an even greater mauling and the Verdun sector was finally deemed to be secure.
Joffre’s influence faded during the battle for Verdun. His aggressive prewar doctrine had simply collapsed in a battle where superior artillery played the decisive role. Heavier guns, indirect fire and greater range gave the Germans a valuable advantage but their strategic errors allowed the French to survive, a victory of sorts. With Papa Joffre politely kicked upstairs, the Young Turks were dispersed to field commands and the artillery was finally able to take full advantage of the increasing numbers of heavy pieces being supplied. Planning began to focus around the artillery instead of the furia francese. The problem with such revolutions is that they occasionally lead to grand assumptions about the utility of the technical innovations forged during the collapse of the old system and tend to forget that the enemy has an even greater reason to monitor such changes.