Blücher and Wellington had been exchanging communications since 10:00 and had agreed to this advance on Frichermont if Wellington's centre was under attack.
Blücher ja Wellington olid hoidnud ühendust alates kella 10 hommikul ning leppinud kokku rünnakus Frichermontile juhul kui Wellingtoni tsenter on rünnaku all.