|Part of Eastern Front of World War I|
Russian troops marching through Prussia
|Commanders and leaders|
|Nikolai Dukhonin|| Paul von Hindenburg|
| First Army|| Eighth Army|
|Casualties and losses|
|61,532 killed or wounded||78,863 killed, wounded, or captured|
The Vistula—Oder Offensive was a military campaign on the Eastern Front of World War I lasting from September 1914 to February 1915. With the Russian victory at the Battle of Tannenberg, the invasion of East Prussia was successful, and the General Staff planned an offensive that would take Russian forces from the Vistula River to the Oder River, taking the territory in between. The Russian First and Second Armies, victors of Tannenberg, were bolstered by the arrival of the Sixth and the Tenth Armies. The offensive was under overall command of General Nikolai Dukhonin. The Germans, meanwhile, planned to stall the Russian advance as long as possible while attempting to mobilize units from the Western Front to the East.