The following day sees the Hanoverian army holding on a line from Hamelin to Voremberg.
Their right flank is anchored on the Hamel river and Hastenbach creek.
The center of the Hanoverian front is deployed north of the town of Hastenbeck, and an artillery battery is situated on high ground behind the town.
The Hanoverian left consists of two entrenched batteries, with grenadier battalions protecting the guns.
The left flank is anchored on the Obensburg.
Cumberland makes the mistake of assuming the hill to be impassable to formed troops and deploys a meager three Jäger companies on its summit, effectively leaving the Hanoverian left flank in the air.
General Chevert is ordered to flank the Hanoverian position with four brigades of troops from Picardy, la Marine, Navarre, and Eu.
This force advances at 9 AM toward the Obensburg in three battalion columns and quickly overwhelms the Jägers.
Cumberland, seeing his position threatened from the rear, orders his reserves and the grenadier battalions protecting the guns to recapture the Obensburg.
The use of these grenadier battalions in the counterattack on the Obensburg means that they are no longer available in the center when the main French attacks go in against the Hanoverian center.
The French main attack consists of general d'Armentieres's attack against Voremberg with five brigades of infantry plus four regiments of dismounted dragoons.
At the same time, the French center assaults the battery immediately north of it.
The Hanoverian grand battery is able to repulse several of the French attacks, but eventually the guns are overrun.
When the Hanoverian reserve infantry arrives on the Obensburg, they are able to turn the tide momentarily, but as Cumberland has begun to withdraw his army, they are unable to maintain the now-isolated position for long.
During the battle, Hastenbeck is almost completely destroyed, only the church, the manse, and the farm house remain intact.
The French have won a narrow victory over Cumberland here, but as he retreats his force begins to disintegrate as morale collapses.
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