How did Spartacus manage to create an efficient army out of escaped slaves?

The formation of an efficient army took place “with sweat and blood.” Spartacus issued a decree according to which the fugitive slaves received weapons that were forged without interruption. Gladiators took a long time to train slaves in the art of war. The rebellious slaves adopted the rich experience of their opponents, and even established their own intelligence. Gradually, their army only strengthened (for example, after the capture of the cavalry, the slaves had their own cavalry troops). In addition, Spartacus with his speeches could raise the morale of slaves.