Thanks!
The 5th Texas had 2 companies of lancers, and they used them at least through 1862. At Valverde, at least one company of lancers charged men from the 2nd Colorado Volunteer Infantry, who formed square and repelled the charge......quite Napoleonic, and a rare event in the ACW.
On the Yankee side, the 6th Pennsylvania had lancers, and apparently used them until some time in 1863.