After securing stores of food and ammunition through the Capture of Oppenheim, Spinola had a choice between taking Heidelberg or Bacharach. On 23 September Spinola consulted with the Spanish commanders, Don Carlos Coloma, Don Gonzalo Fernández de Córdoba, Don Diego Felípez de Guzmán and Hendrik van den Bergh. There was talk of marching on Heidelberg, Frankenthal or Bacharach, but finally Spinola decided to opt for Bacharach. Bacharach was an important strategic point because it was a bridgehead over the Rhine and would be a link between the part of the Palatinate occupied by the Spaniards and the city ofMainz. In addition, the operation would buy time for the arrival of reinforcements expected from the Spanish Netherlands. On 27 September, news came to Spinola that a force from the United Provinces of about 5,000 men under the command of Henry of Nassau-Dillenburg and Sir Horace Vere had crossed the Moselle in Kerpen to support Frederick V. Spinola, ignoring the entity of Vere's forces, composed of Dutch, English and Scottish volunteers sent by King James I of England, decided to move with his army to the west bank of the Rhine and await the Protestant forces. With his attention centered on the arrival of the Anglo-Dutch relief, Spinola remained near the road with the bulk of his army, and entrusted the capture of Bacharach to Don Gonzalo Fernández de Córdoba.
Battle
On 29 September Córdoba marched with his forces and captured Lorch, forcing the few defenders to surrender. He had also sent another group of about 2,000 men directly to Bacharach. This group approached the outskirts of Bacharach at about 2 am. With the arrival of the Spaniards, the Protestant soldiers outside the town threw down their muskets and fled into the town. Córdoba's men then proceeded to build a bulwark behind the town. At dawn, the defenders, aided by heavy mist, fired shots of musket, killing three Spaniards and wounding three more. Shortly thereafter the bulk of the forces led by Córdoba arrived. Demoralised by the arrival of the Spanish, the officers of the garrison decided to surrender. The Spanish troops entered Bacharach at 3 pm. Two captains and 94 English soldiers, among other German troops, were taken prisoners.
Aftermath
Córdoba left a garrison of 300 soldiers in Bacharach and sent most of his troops under the commanders Diego Ruiz and Baltasar de Santander to capture Kaub. The small garrison of that town soon surrendered. Shortly thereafter, the Spaniards took the Pfalzgrafenstein Castle. Spinola, meanwhile, focused on intercepting the Anglo-Dutch relief, but the Protestant force did not appear. The Anglo-Dutch force went instead to Worms unhindered. In August 1621, Mainz fell to Spinola's army of 15,000 men, now under the command of Córdoba. Meanwhile, General Spinola, on his return to the Netherlands where the Eighty Years' War was still going on, lay siege to Jülich, and after five months of siege the city fell to the Spaniards, reversing Maurice's success of 1610.