The Siege of Cassel (March 1761) was a failed attempt by Duke Ferdinand of Brunswick to capture French-held Kassel, the capital of Hesse-Kassel. Brunswick lifted the siege after forces of the Duc de Broglie inflicted heavy casualties on his forces at the Battle of Grünberg, making continuation of the siege untenable.
Coordinates: 51°19′11″N 9°29′52″E / 51.3197°N 9.4978°E