The Battle of Tannenberg comes to an end as the 2nd Army ceases to exist. The Germans count 92,000 Russian prisoners taken, and the event sends shockwaves around the world as the Germans take the first major victory of the Great War.

The Russian 2nd Army collapses and its commander commits suicide in disgrace. Meanwhile, a counterattack is launched from Russian Poland in a desperate attempt to save what little remains of the 2nd Army.

The Germans close their trap and the Russian 2nd Army rapidly begins to collapse. With their planned escape route at Neidenburg closed, the Russians refocus all of their efforts on one last attempt to breakout via Ortelsburg.

The Germans spring their trap, and by the end of the day both of the Russian flanks are collapsing, with the center holding but on the brink of envelopent.

The Germans begin their movements, rapidly closing their pincers around the 2nd Army. Despite this, the Russians still believe the Germans are collapsing, and do not react to increasing evidence of the disaster impending in the south.

The Germans launch their counterattack, and despite failure near Usdau in the west find themselves nearly destroying the Russian VI Corps in the east, opening a possibility of a decisive victory.

The Germans begin to mass their forces in the south, preparing to counterattack against Samsonov’s 2nd Army. The Russians are as of yet unaware, and indeed believe that the Germans are withdrawing toward the Vistula, thus spreading their forces thin to envelope as many of them as possible.

The Germans continue their redeployment, as well as a tactical withdrawal in the south. Meanwhile, the Russian 2nd Army interprets this withdrawal as a general retreat, altering their plans accordingly.

As Hindenburg and Ludendorff arrive to take command, the Russians attack in the south. Despite the long odds, the German XX Corps is able to hold the line at Orlau, and only lose Lahna after a heavy fight.

OHL appoints a new commander and Chief of Staff for the 8th Army as the retreat from Gumbinnen continues. Meanwhile, Neidenburg falls to Samsonov’s 2nd Army as the Russians continue to press deeper into East Prussia.

After the defeat at Gumbinnen, the Germans retreat behind the Angerapp, while calls go back and forth between 8th Army headquarters and the General Staff regarding the situation. Meanwhile, the Russian 2nd Army is poised to commence its attack in earnest against the German southern flank.

The Germans launch their counterattack near Gumbinnen, hoping to break the Russian 1st Army in the north before the 2nd Army envelops them from the south. Despite victories on both flanks, the German corps in the center is almost destroyed, resulting in disaster for the entire army.

As the Russians continue to push deeper into East Prussia, the Germans prepare to launch a counterattack to blunt one of the Russian pincers before they find themselves enveloped.

After the bloody nose given to him by von Francois and the German I Corps, General Rennenkampf takes his Russian 1st Army further north to flank the Germans and enter a gap he believes is between the I Corps and the fortress of Konigsberg. Meanwhile, in the south, General Samsonov’s 2nd Army begins to march westward.

The Russians cross the border to invade East Prussia, encountering the Germans of I Corps, which has dug in around Stalluponen near the border in contradiction of existing orders. Despite being outnumbered by five to one in some places, the Germans are able to stop the Russians before withdrawing in the night.