General Samsonov’s objective line, on a level with Allenstein, was 43 miles from the frontier, about three and a half or four days’ march if all went well. Between his starting point, however, and his goal were many opportunities for the unexpected hazards—what Clausewitz called the “frictions”—of war. Owing to the lack of an east-west railway across Russian Poland to East Prussia, Samsonov’s army could not cross the frontier until two days behind Rennenkampf’s and would already have been on the march for a week before reaching the frontier. Its line of march was along sandy roads through a waste of undeveloped country spotted with forests and marshes and inhabited by a few poor Polish peasants. Once inside hostile territory there would be few resources of food and forage.
General Samsonov, unlike Rennenkampf, was new to the region and unfamiliar with his troops and staff. In 1877, at the age of eighteen, he had fought against the Turks; he was a general at forty-three; in the Russo-Japanese War he too had commanded a cavalry division; since 1909 he had been in semimilitary employment as governor of Turkestan. Aged fifty-five when the war broke out, he was on sick leave in the Caucasus and did not reach Warsaw and Second Army headquarters until August 12. Communication between his army and Rennenkampf’s, as well as to Jilinsky’s headquarters in the rear which was to coordinate the movements of both, was erratic. Precision in timing was not in any case a notable Russian virtue. Having played out the campaign in war games in April before the war with most of the same commanders and staff as were to take the field in August, the Russian General Staff was gloomily conscious of the difficulties. Although the war games, in which Sukhomlinov played the role of Commander in Chief, revealed that the First Army had started too soon, when war came the same schedule was adhered to without change. Counting two days for Rennenkampf’s head start and four days for Samsonov’s march, there would be a period of six days during which the German Army would have to face only one Russian army.
On August 17 General Rennenkampf’s two cavalry corps, guarding his flanks on right and left, had orders not only to screen his advance but to cut both branches of the railway in order to prevent the withdrawal of German rolling stock. Having deliberately used a railroad gauge different from the German as a defense against invasion, the Russians could not bring up their own rolling stock, or use the invaluable network of railroads in East Prussia unless they captured German trains. Naturally, the Germans left little rolling stock behind to be captured. The Russian Army, moving farther and farther from its base into hostile country, began almost at once to outrun its horse-drawn and not fully organized supply train. For communication, lacking the wire to lay their own lines, the Russians were dependent on German telegraph lines and offices, and when these were found destroyed they resorted to sending messages by wireless, in clear, because their divisional staffs lacked codes and cryptographers.
Little reconnaissance or artillery spotting was accomplished by airplane, most of the Air Force having been sent to the Austrian front. At sight of an airplane, the first they had ever seen, Russian soldiers, regardless of its identity, blazed away with their rifles, convinced that such a clever invention as a flying machine could only be German. The enlisted soldier consumed quantities of black bread and tea which were said—though it is not easy to see why—to give him a characteristic odor rather like that of a horse. He was armed with a four-edged bayonet which when mounted on a rifle made a weapon as tall as a man and in hand-to-hand combat gave him an advantage over the German. In firepower and fighting efficiency, however, German preponderance in artillery made two German divisions equal to three Russian. The Russian disadvantage was not helped by the mutual hatred of Sukhomlinov as War Minister and the Grand Duke as Commander in Chief, especially as liaison between front and rear was bad enough and the problem of supply worse. Before the fighting was a month old the shortage of shells and cartridges was already so desperate and the indifference or lethargy of the War Ministry so discouraging that on September 8 the Grand Duke was driven to appeal directly to the Czar. On the Austrian front, he reported, operations would have to be held up until stocks of shells reached 100 per gun. “At present we have only 25 per gun. I find it necessary to request Your Majesty to hasten the shipment of shells.”
The cry “Kosaken kommeni” (The Cossacks are coming!) echoing out of East Prussia weakened Germany’s resolve to leave the province with only a minimum defense. The Eighth Army in East Prussia, consisting of four and a half corps, one cavalry division, garrison troops of Königsberg and some territorial brigades, was about equal in numbers to either one of the two Russian armies. Its orders from Moltke were to defend East and West Prussia but not to allow itself to be overwhelmed by superior forces or to be driven into the fortress camp of Königsberg. If it found itself threatened by greatly superior forces, it was to withdraw behind the Vistula, leaving East Prussia to the enemy. Such orders contained “psychological dangers for weak characters,” in the opinion of Colonel Max Hoffmann who was now deputy Chief of Operations for the Eighth Army.
The weak character Hoffmann had in mind was the Eighth Army’s commander, Lieutenant-General von Prittwitz und Gaffron. As a court favorite Prittwitz had enjoyed a career of rapid promotions because, according to a fellow officer, he “knew how to get the Kaiser’s ear at table with funny stories and salacious gossip.” Now sixty-six years old and notorious for his girth, he was a German version of Falstaff, “impressive in appearance, conscious to the highest degree of his self-importance, ruthless, even coarse and self-indulgent.” Known as der Dicke (Fatty), he was without intellectual or military interests and never moved if he could help it. In vain Moltke, who considered him unfit for his assignment, had tried for years to remove him from the designated command of the Eighth Army; Prittwitz’s connections were proof against his efforts. The best Moltke could do was to appoint his own Deputy, Count von Waldersee, as Prittwitz’ Chief of Staff. In August, Waldersee, suffering from the after effects of an operation, was in Hoffmann’s opinion “not up to par,” and since Prittwitz never had been, this left Hoffmann in the happy assurance that real power to direct the Eighth Army lay in the hands of the best qualified person, himself.
Anxiety for East Prussia became acute when on August 15 Japan declared for the Allies, freeing large numbers of Russian forces. In making or keeping friends, a task that forever eluded it, German diplomacy had failed again. Japan had her own ideas of her best interests in a European war, and these were well understood by their intended victim. “Japan is going to take advantage of this war to gain control of China,” foretold President Yuan Shi-kai. As it proved, Japan used the opportunity of the war while the European Powers were too busy to stop her, to impose the Twenty-one Demands on China and to make the incursions into Chinese sovereignty and territory which were to twist the history of the twentieth century. To start with, the immediate effect of Japan’s joining the Allies would be to release Russian forces from the Far East. Conjuring up visions of added Slavic hordes, the Germans now had new cause to be nervous about leaving East Prussia to be held by the lone Eighth Army.
From the beginning General von Prittwitz was having trouble controlling the commander of his Ist Corps, General von François, a bright-eyed officer of Huguenot ancestry, fifty-eight years old, who looked not unlike a German Foch. The Ist Corps was recruited from East Prussia, and its commander, determined that not one Slav should tread on Prussian soil, threatened to upset Eighth Army strategy by advancing too far.
Based on Hoffmann’s calculations, the Eighth Army expected Rennenkampf’s army to advance first, and anticipated meeting it in battle on August 19 or 20 in the area of Gumbinnen, about twenty-five miles from the Russian frontier, before it reached the Insterburg Gap. Three and a half corps, including François’ Ist Corps, and a cavalry division were sent to meet it while the fourth corps was sent southeast to make contact with Samsonov’s approaching army. On August 16 Eighth Army headquarters moved forward to Bartenstein, closer to the Insterburg front, where it was discovered that
François had already reached and passed Gumbinnen. He believed in taking the offensive at once whereas Hoffmann’s strategy was to let Rennenkampf’s army come as far west as it could on its first two days’ march on the theory that the farther it advanced from its base, the more vulnerable it would be. Hoffmann did not want it halted, but on the contrary allowed to reach the Gumbinnen area as soon as possible so as to give the Germans time to engage it alone before having to turn to face Samsonov.
François’ advance beyond Gumbinnen where he had established his headquarters on August 16 threatened to pull the rest of the Eighth Army after him to support his flanks, thus extending itself beyond its powers. Prittwitz on the 16th peremptorily ordered him to halt. François indignantly protested by telephone that the nearer to Russia he engaged the enemy, the less risk to German territory. Prittwitz replied that a sacrifice of part of East Prussia was unavoidable, and dispatched a written order reminding François that he was “sole commander” and again prohibiting further advance. François ignored it. At 1:00 P.M on August 17, Prittwitz “to his great astonishment” received a message from François that he was already in action in Stalluponen, twenty miles beyond Gumbinnen and only five miles from the Russian frontier.
That morning when Rennenkampf’s army crossed the frontier in full force, his IIIrd Corps in the center began its march, more by lack of coordination than by design, several hours ahead of the other two. Russian reconnaissance having located François’ forces at Stalluponen, orders were given to attack. Battle was joined a few miles east of the town. General von François and his staff were watching the progress of the fight from the steeple of the Stalluponen church when, “in the midst of this nerve-wracking tension,” the church bell suddenly tolled with appalling sound upon their eardrums. The steeple shook with its vibrations, the telescope trembled on its tripod, and infuriated officers let loose a hail of Teutonic oaths upon the head of the unfortunate town councilman who had felt it to be his duty to warn the people of the Russians’ approach.
Equal fury raged at Eighth Army headquarters on receipt of the message from François. He was ordered by telephone and telegraph to break off action, and a major-general was rushed off in person to confirm the order. Climbing to the belfry in no less bad temper than already raged there, he shouted at General von François, “The General in Chief orders you to stop the battle instantly and retire upon Gumbinnen!” Furious at the tone and manner, François grandiloquently retorted, “Inform General von Prittwitz that General von François will break off the engagement when he has defeated the Russians!”
Meanwhile a German brigade with five batteries of artillery had been sent around from the German right flank to attack the Russians from the rear. As the early advance of the Russian IIIrd Corps, especially of its 27th Division which was now engaged at Stalluponen, had opened a gap between itself and the neighboring Russian corps on its left, it was unprotected from the German attack. The regiment upon whom the German attack fell, broke and fled, involving the whole 27th Division in retreat and leaving 3,000 prisoners to the Germans. Although the rest of Rennenkampf’s army reached the objective line laid down for it that day, the 27th Division had to retire to the frontier to reform, holding up the scheduled advance for the following day. Brimming with victory, François retired that same night toward Gumbinnen, after evacuating Stalluponen, personally convinced of the virtues of disobedience.
Despite the check, Rennenkampf’s Army renewed its advance. But as early as August 19 it had begun to feel the drain of incomplete services of supply. Hardly fifteen miles from their own frontier, corps commanders reported supplies not coming up and messages not getting through to each other or to army headquarters. Ahead of them roads were clogged by massive, milling droves of cattle and sheep herded by the fleeing populace. The flight of the people and the retrograde movement of François’ corps caused Rennenkampf and his superior, General Jilinsky, commander of the Northwest Front, to believe that the Germans were evacuating East Prussia. This did not suit the Russians, for if the German army retired too soon it would escape destruction by the Russian pincers. Rennenkampf consequently ordered a halt for the 20th, less because of his own difficulties than to entice the enemy forward into battle and allow more time for Samsonov’s Second Army to come up for the decisive blow upon the German rear.
General von François was more than willing. With battle in his nostrils once more, he telephoned General von Prittwitz at Eighth Army headquarters on the 19th and clamored for permission to counterattack instead of continuing his retreat. It was a golden opportunity, he asserted, because the Russian advance was loose and scattered. He described feelingly the flight of the inhabitants and passionately urged the shame of yielding the soil of Prussia to the horrid footprint of the Slav. Prittwitz was torn. Intending to fight behind Gumbinnen, the Eighth Army had well-prepared positions along the river Angerapp. But von François’ too early advance had upset the plan and he was now some ten miles on the far side of Gumbinnen, to the east. To allow him to attack there would mean to accept battle away from the line of the Angerapp; the other two and a half corps would be pulled away with him and would be separated further from the XXth Corps sent to watch the approach of Samsonov’s army from the south and which might need support at any time.
On the other hand, the spectacle of a German army retiring without serious battle, even if only for twenty miles, especially in full view of a terrified population, was distasteful. The decision was made more difficult when the Germans intercepted Rennenkampf’s order to halt. The order was sent to Russian corps commanders by wireless in a simple code which a German professor of mathematics attached to the Eighth Army as cryptographer had no difficulty in solving.
This raised the question: How long would Rennenkampf halt? The time in which the Germans would be free to fight one Russian army without the other was running short; by that evening three of the six days would be gone. If the Germans waited on the Angerapp for Rennenkampf to come against them, they might be caught between both armies at once. Just at this moment, word was received from the XXth Corps that Samsonov’s army had that morning crossed the frontier. The second claw of the pincer was advancing. The Germans must either fight Rennenkampf at once, giving up their prepared position on the Angerapp, or disengage and turn against Samsonov. Prittwitz and his Staff decided on the former, and told François to attack next morning, August 20. The only difficulty was that the other two and a half corps, dutifully waiting on the Angerapp, could not be activated in time to catch up with him.
Before dawn von François’ heavy artillery opened fire, taking the Russians by surprise; the shelling continued for half an hour. At 4:00 A.M. his infantry moved forward over the stubbled fields in the uncertain dark until they came within rifle distance of the Russian lines. As morning broke, combat spread like a licking fire over the front. Russian field batteries poured shells on the advancing gray lines and saw the white road ahead suddenly turn gray with the bodies of the fallen. A second wave of gray charged, coming nearer. The Russians could make out the spiked helmets. Their batteries fired again, and the wave went down and another came. The Russian guns, supplied with ammunition at a rate of 244 rounds per day, were now firing at a rate of 440 per day. An airplane with black crosses flew over and bombed their artillery positions. The gray waves kept on coming. They were within 500 yards when the Russian guns stuttered and fell silent; their ammunition was used up. François’ two divisions cut up the Russian 28th Division, inflicting a casualty rate of 60 per cent, virtual annihilation. François’ cavalry with three batteries of horse artillery made a wide sweep around the open Russian end, unopposed by the Russian cavalry which, having no artillery, took itself off, permitting the Germans to fall upon the Russian transport in the rear. These were the fortunes of the corps on Rennenkampf’s extreme right; on his center and left matters went very differently.
Here the Russians, warned by the sound of François’ predawn cannon, were ready for the attack which came piecemeal o
ver a front 35 miles wide. In the center the German XVIIth Corps did not reach the front until 8:00 A.M., four hours behind François, and on the German right the Ist Reserve Corps did not arrive till noon. The XVIIth was commanded by General August von Mackensen, another of the group of generals who had fought in 1870 and were now sixty-five or over. The Ist Reserve was commanded by General Otto von Below. They had been behind the Angerapp on the evening of the 19th when they received the unexpected order to join François in an offensive beyond Gumbinnen next morning. Hurriedly assembling his units, Mackensen crossed the river during the night to become entangled on the other side among refugees, wagons, and livestock on the roads. By the time they sorted themselves out and advanced far enough to make contact with the enemy, they had lost the advantage of surprise and the Russians opened fire first. The effect of shelling by heavy guns is devastating, whoever is on the receiving end, and in this, one of the rare cases of 1914, the receivers were Germans. The infantry was pinned to the ground lying face down, not daring to raise their heads; ammunition wagons were blown up; horses were galloping riderless. By afternoon Mackensen’s 35th Division broke under the fire. A company threw away its arms and ran; another caught the panic; then a whole regiment, then those on either side of it. Soon the roads and fields were covered with battalions streaming to the rear. Staff and divisional officers and Mackensen himself tore across the front in motors, attempting to stem the rout which continued for fifteen miles before it could be halted.