โCaesar defeated their army on the banks of the Aisne; then, with a celerity of movement that never allowed his foes to unite, he moved in succession against the Suessiones, Ambiani, Nervii, and Aduatici, conquered them, despoiled them, and sold the captives to the slave merchants of Italy.โ
โ Will Durant, Caesar and Christ (The Story of Civilization, Vol. 3)
My new-to-me word:
Celerity (n.): swiftness, speed, or rapidity of motion.
From Latin celeritas, meaning โquickness.โ