Final answer:
The historical sources provided do not detail the specific methods of espionage used by Scipio's soldier spies, therefore we cannot provide a factual answer regarding their tactics behind enemy lines. Scipio is known for his strategic victories that earned him the title Scipio Africanus.
Step-by-step explanation:
The question regarding how Scipio's soldier spies got behind enemy lines pertains specifically to the military tactics used during the Second Punic War, where Scipio ultimately defeated the Carthaginian forces in Spain and later in Africa, famously leading to the defeat of Hannibal at the Battle of Zama in 202 BCE.
While the provided references detail various strategic methods and encounters of Roman generals during different conflicts, they do not contain explicit descriptions of Scipio's espionage tactics. Therefore, without proper historical records or sources detailing the espionage methods, we cannot confidently provide a factual answer to how Scipio's spies infiltrated enemy lines.
What we do know, however, is that Scipio was an adept general who managed to cut off Hannibal's reinforcements and supplies, significantly contributing to Rome's victory and earning Scipio the title of Scipio Africanus.