Yeah, it looks like the main evidence is that there’s a mention of a similar formation to testudo being seen in western China a couple decades later, and maybe some Roman-style fortifications. According to Wikipedia a large number of prisoners were sent to Merv somewhat nearby, so it’s all very suggestive, but definitely no smoking gun.
There was one legion that got lost in Persia and ended up working for the Chinese.Edit: Maybe, maybe not.
Crassus’ lost legion is just conjecture, there’s no convincing evidence. It’s a fun thought, though.
Is it? Oh, I didn’t realise. I’ll cross that out.
Yeah, it looks like the main evidence is that there’s a mention of a similar formation to testudo being seen in western China a couple decades later, and maybe some Roman-style fortifications. According to Wikipedia a large number of prisoners were sent to Merv somewhat nearby, so it’s all very suggestive, but definitely no smoking gun.