The Prussian I Corps attacked French troops before Papelotte late in the Battle of Waterloo.
Commanded by Lieutenant-General Hans Ernst Karl von Zieten, the corps reached the battlefield during the evening after marching from the east. Its arrival strengthened Wellington’s threatened left flank and increased pressure on the French troops holding the Papelotte–Smohain area.
French forces under Durutte had occupied parts of the position earlier, but the Prussian advance forced them back. Prussian infantry, including the 24th Regiment and Landwehr and rifle units, helped retake Papelotte and nearby ground. Zieten’s cavalry later added to the pressure as the French right began to collapse.
The timing matters: Prussian IV Corps had begun the major attack around Plancenoit earlier, while I Corps arrived later to support Wellington directly. That distinction is a frequent source of mix-ups when identifying which Prussian corps fought at each sector of the battlefield.