A legion in India?

[Jona Lendering]

The Sassanians captured ten of thousands Romans in their battles against them. Especially after the disaster at Edessa in 260AD.
We were told that many of them were used for constructing streets, bridges and more. Why not some fighting for the Sassanian king Shapur I? The Sassanians of used captured warriors for their own puposes, sending them to far borders away from their own cultural background.

Shapur I campaigned after his 3rd Roman campaign agains the Kushans and expanded Sassanian overlordship till India.

It's more than "we are told", actually: two bridges (at Pol-e Dokhtar and Shushtar) and one city (Bishapur) have survived. The story is certainly within the realm of the possible, that's for sure.