Battle of Đồng Đăng (1885)

Tonnot's vanguard had won enough space for the brigade's main body to close up and deploy in its turn. De Négrier sent half of his troops to its left and the other half to its right. Diguet's legionnaires and Geil's Tonkinese now found themselves holding the centre of the French line. De Négrier had already decided to throw his right wing forward, in order to secure Bérard Mound for his artillery, and he now decided to refuse his left wing, deploying the brigade in a diagonal line of three mutually-supporting echelons astride the Mandarin Road. But this deployment, in hilly terrain, was a necessarily slow business, and at around midday the Chinese attempted to envelop both French flanks, perhaps hoping to catch them unprepared.[7]

The Chinese attack on the French left, where de Négrier had refused his line, had little chance of success. The French left wing was held by the 23rd Line Battalion, which was occupying a hill to the southwest of the Mandarin Road behind and to the left of Diguet's legionnaires. The attackers, who issued in large numbers from the Western Forts, attempted to advance up the valley towards Ban Vinh to engage the 23rd Battalion. They had more than 2 kilometres (1.2 mi) to march, and before they had covered half this distance they came under fire from a section of French artillery and the three Legion companies deployed to the left of the Mandarin Road. It became clear that the attack was not going to succeed, and the Chinese fell back. The 23rd Battalion did not have to fire a shot in this action, and the Chinese made no further attempts to move against the French left.[8]

By contrast, the Chinese attack on the right against Bérard Mound, occupied by Roperh's battery and its escorts and Bérard's Legion company, was pressed home vigorously. The Chinese infantry were in considerable strength, and on this occasion were adequately supported by their artillery, which began to engage Roperh's battery from its positions on the cliffs behind Đồng Đăng. The enemy gunners soon found the range and, uniquely during the Sino-French War, the French came under well-aimed artillery fire. Disconcerted by the speed and accuracy of the Chinese fire, Roperh's battery had to change position. De Négrier sent Commandant Schoeffer to Bérard Mound to reinforce its defenders with Lascombes and Gaucheron's companies from his own Legion battalion. Lascombes and Bérard then led their men in a counterattack against a hill overlooking the French position. Bérard was shot in the chest and seriously wounded during this counterattack, but Lieutenant de Féraudy immediately assumed command of his company and drove home the French charge. The Chinese fell back in disorder.[9]

The French had defeated both Chinese flanking attacks. They could now consider taking the offensive themselves. De Négrier's plan was a simple and logical three-step operation. To win the battle, the French had to throw the Chinese off the limestone massif. To attack this position, they had first to take Đồng Đăng. To assault Đồng Đăng without suffering crippling casualties, they had to weaken its defences by reducing the Western Forts. The first step was therefore to capture the Western Forts.

De Négrier prepared the attack on the Western Forts with a lengthy artillery bombardment of the Chinese positions. De Saxcé and Jourdy's batteries first engaged the Chinese guns in their emplacements on the limestone massif, and by 1:00 pm had completely silenced them. The French batteries then turned their attention to the Chinese positions on the hills to the east of the Mandarin Road that ran back to the Chinese frontier. So far the French infantry on the right of de Négrier's line had shown no signs of advancing, and the Chinese defenders saw no reason to hold their ground under artillery fire. Unable to reply to the French guns, they evacuated their trenches on the forward slopes and fell back to more sheltered positions on the reverse slopes. Finally, the French guns swept the Chinese positions around the Western Forts.

Just before 3:00 pm, when he judged that the Chinese were sufficiently demoralised, de Négrier ordered Herbinger to capture the Western Forts with the 111th Line Battalion and the five closest companies of Diguet and Schoeffer's Legion battalions. The attack would be screened by Geil's Tonkinese. The Chinese did not attempt to hold the forts in the face of the French advance. Their right wing battalions abandoned their positions and began to retreat along the path to That Ke. Herbinger ordered Diguet's men to pursue the retreating Chinese for some distance and set up a blocking position astride the path. He then reorganised the rest of his troops for the next step in de Négrier's programme, the assault on Đồng Đăng.

Most of the houses in the southern part of the town had been set alight by the French artillery bombardment, and the position was now held only by small groups of Chinese skirmishers. Herbinger decided that the main assault on the town would be made by the 111th Battalion, screened by the Tonkinese and with Brunet and Michel's companies of Schoeffer's Legion battalion in support. The 111th had to advance across one kilometre (0.62 mi) of open ground, under fire from both the Chinese on the summit of the limestone massif and from a group of Chinese skirmishers in Đồng Đăng itself. The French conscripts moved forward at a brisk trot and eventually reached the Đồng Đăng stream, 200 metres (660 ft) from the outskirts of the town. Here they hesitated. Men began to fall to the enemy's fire. The company officers jumped into the stream to set an example, and waded through waist-high water to the other side. Once they clambered onto dry land the soldiers had only one thought: to reach the shelter of Đồng Đăng and escape from the plunging fire from the limestone massif. In complete disorder, running at full tilt to close the distance as quickly as possible, the young soldiers of the 111th Battalion charged wildly into the blazing town. The astonished company officers raced to place themselves at the front of this impromptu charge, waving their swords above their heads to spur on their men to yet greater efforts. The speed and fury of this improvised attack took the Chinese skirmishers completely by surprise. They tried to evacuate Đồng Đăng but were not fast enough. The soldiers of the 111th trapped laggards in the streets or inside houses, and clubbed or bayoneted them to death. The 111th Battalion then reformed inside Đồng Đăng, where it was in reasonable cover from the Chinese on the limestone massif.[10]

View of Đồng Đăng and the limestone massif to its north, October 1885

The 23rd Battalion, which had seen little of the battle so far, came up from its position on the French left wing to add its weight to the attack. Herbinger then led both line battalions forward up the slopes to the west of the massif. Schoeffer's two Legion companies followed behind, still in support. Geil's Tonkinese had charged with the 111th into Đồng Đăng, and Herbinger ordered them to secure Đồng Đăng while the French attacked the key point in the Chinese line.[11]

Once the 111th Battalion moved out of Đồng Đăng, it again came under plunging fire from the summit of the massif. Again, men began to fall as the battalion scrambled up the slopes as fast as it could. Faure deployed the battalion's four companies into skirmish order, with three companies up and one in support. The forward company on the right, closest to the Chinese positions, took the heaviest casualties, and 2nd Lieutenant Émile Portier was mortally wounded as it advanced. Despite its casualties the 111th pressed on up the slopes to the attack. Lieutenant de Colomb captured the foremost Chinese trench with his company, but resistance then stiffened and the entire battalion had to be thrown against the Chinese entrenchments before they were taken.[11]

With the Chinese right wing falling back towards That Ke, the French proceeded to throw back the Chinese still holding out on the summit of the limestone massif. The 111th Battalion and the two supporting Legion companies had already reached the summit at its southern tip and now moved along its eastern edge, clearing the enemy from their vantage points above the Mandarin Road. Small parties of Chinese clung to several isolated rocks, but were soon prised out of these positions by the French infantry.[11]

2nd Lieutenant Émile Portier, mortally wounded at Đồng Đăng, 23 February 1885

It only remained to deal with a strong enemy force holding a hill just to the northeast of Đồng Đăng, which overlooked the entrance to the valley leading to the Chinese frontier and prevented the French from advancing up the Mandarin Road. Geil led his Tonkinese forward from Đồng Đăng to pin the Chinese frontally, de Saxcé's battery occupied a hill just to the north of Pho Bu from which it could engage them at close range, and Lascombes and de Féraudy's Legion companies began to work their way around their flank. Realising that their position would soon become untenable, the Chinese retreated before they could be forced from it.[11]

With the enemy in full retreat either towards That Ke or back into China, de Négrier ordered the two foremost companies of Diguet's battalion to remain in position astride the path to That Ke, the 111th Battalion to secure the limestone massif, and the rest of the brigade to close up on the village of Cua Ai and the Gate of China. The first units to reach the Gate of China were Brunet and Michel's companies of Schoeffer's battalion, which had left the 111th Battalion alone on the summit of the limestone massif and climbed back down to the plain. The gate itself was protected by two flanking forts and trenches had also been dug along the slopes of the neighbouring hills, but the Chinese troops occupying these defences had been brought forward during the battle to join their comrades around Đồng Đăng. When their lines broke, the French pursued them so closely that they were unable to rally in these positions. As a result, the legionnaires occupied the Gate of China and pushed on across the frontier into China without meeting any resistance. The rest of the brigade gradually came up to Cua Ai. Lascombes and de Féraudy's companies, on the hills to the east of the Mandarin Road, made their way down into the Đồng Đăng valley and reached the Gate of China shortly after Schoeffer's men. On the extreme right Schoeffer pulled in Gaucheron's company, which had served as a flankguard for most of the afternoon. Finally, Geil's Tonkinese riflemen and the 23rd Battalion followed the road. By nightfall the bulk of the 2nd Brigade was assembled at the Gate of China.[12]

An important factor in the Chinese defeat at Đồng Đăng was the failure of the Chinese commander Pan Dingxin (潘鼎新) to concentrate his forces to meet the French attack. A sizeable contingent of fresh troops under the command of Feng Zicai (馮子才) was left to cover a border crossing several kilometres to the east of Đồng Đăng, and took no part in the battle.[13]