Originally Posted by
Ludens
He did read the FAQ, but he wanted to suggest a way in which the LS could be included. However, we don't know with what units LS was associated in its early days. Giving it to the "elite" first cohort and praetorian units may not represent the truth. At least one EB member believes that LS was not an improvement, but a cheaper replacement for LH, so you would not expect it on elite units. (And yes, I know this is disputed. We've had discussions on this before: do a forum search if you wish to know more.)
Anyway, the Praetorian cohort was a front-line unit in its early days. I know they campaigned with Germanicus the Younger against Arminius.