The Blacks were outnumbered and were also threatened by an invading Dutch division from Halberstadt. In order not to fall between the two divisions, the Duke decided to face the Westphalians north of Brunswick, near the village of Ölper, to attempt to break through to the north. At 14:00 the Black crowd moved toward Ölper, reinforced by about 200 citizens of Braunschweig, who were equipped with material looted from Halberstadt. Major Korfes destroyed the crossings over the Oker, in order to prevent flank attacks by the enemy. An hour later, Reubell's troops appeared at Ölper; the lead Westphalian cuirassiers were immediately fired upon and retreated. The First Infantry Regiment of Westphalia now advanced on the village of Ölper. Friedrich Wilhelm left and withdrew his troops to the south and stationed artillery on a hill. From there they could counter the Westphalian infantry attack. Now Brunswick continued with their Duke at the head of the counter-attack; Friedrich Wilhelm's horse was killed, but he himself remained unhurt. However, the Captain of Rabiell, commander of the advancing companies, fell. The Blacks progressively withdrew, without having recaptured Ölper. A direct attack on the Westphalians that followed failed. The bold counterattack against the Hussars under Major Schrader did do damage to them and caused great confusion in the ranks of Westphalia. An artillery battle finally destroyed one of Brunswick's guns, but further attacks never came. Although the Duke was planning a night attack, Reubell had presciently already cleared the village of Ölper. commemorating the 1809 Battle of Ölper in the community of Braunschweig-Ölper.
Losses
The casualty figures for the numerically far superior Westphalian troops were estimated to be between 200 and 500 men. Estimates for losses of Black Brunswicker troops vary from 40 and 86, but these are believed to be understated.
Results and consequences
Although Friedrich Wilhelm is believed to have made some tactical errors, the Brunswick troops fought bravely against a numerically superior enemy. This was due in part to the greater fighting experience of the Brunswick troops and their high morale and also to the hesitation of General Reubell. Even if at the end of the day the Westphalians took the battlefield, they did not manage to defeat the Black crowd, nor stop their further movement to the North Sea. On 2 August the Brunswick Corps broke through and reached to about Celle, Hannover, Nienburg and Delmas, while pursued by Reubell's troops. On 7 August they reached Elsfleth, from which they were shipped to Helgoland and later to the Isle of Wight. Duke Friedrich Wilhelm joined his troops in British service, and fought from 1810 to 1814 under the command of Wellington in Portugal and Spain. General Reubell was dismissed from his post by Napoleon because of his failure, but fled to America before he could be brought to justice. In 1824 and 1833 Duke Charles the Second and Duke William, sons of the Black Duke, donated a Cross of Honor for 1809, which they awarded to the participants.
Literature
Detlef Wenzlik; Unter der Fahne des Schwarzen Herzogs. Hamburg, 2002
Gustav von Kortzfleisch; Geschichte des Herzoglich Braunschweigischen Infanterie-Regimentes und seiner Stammtruppen 1809-1902. 3 Bände. Braunschweig, 1896–1903.
Gustav von Kortzfleisch; Des Herzogs von Braunschweig Zug durch Norddeutschland im Jahre 1809. Berlin 1894
Willi Müller: Das Gefecht bei Ölper am 1. August 1809, in: Niedersächsisches Jahrbuch für Landesgeschichte Nr. 1, 1924
Hermann Voges: Zur Geschichte des Gefechtes bei Ölper am 1. August 1809, in: Niedersächsisches Jahrbuch für Landesgeschichte Nr. 3, 1926