Once Moore made his presence known Napoleon responded with customary swiftness and decisiveness. The Spanish were defeated and no longer an organized threat. His army was generally concentrated while the enemy was dispersed. With the initiative firmly in his grasp, Napoleon seized the chance to destroy Britain's only field army. When Moore realized he was in serious danger of being trapped he called off his advance and went into headlong retreat. This epic dash and chase would cover more than , during which the British cavalry and the infantry of the Light Brigade were used to cover the movements of Moore's army after their retreat began on 25 December. This saw them engage the French in small rearguard clashes, including defeating a French cavalry force and capturing General Charles Lefebvre-Desnouettes at Benavente before entering the mountains of Galicia, and another at Cacabelos where General Colbert-Chabanais was killed by a British rifleman.