Curious about that!
Do you have a citation for it?
I know about a couple of Delaware (Lenni Lanape) scouts that worked for the US Army. Shawnee working for the Mexican Army’ I’d like to know more. During Spanish colonial rule or Mexican Republic times?
Delewares massacred the Enoch Brown school?
Shawnee Scalphunters in Mexico
https://frontierpartisans.com/8702/shawnee-spybuck-borderland-badass-part-ii/
https://en.wikipedia.org/wiki/James_Kirker
” Kirker was given a contract by the government of Chihuahua to fight Apaches. He was authorized to raise 200 men and would be paid for Apache prisoners.[3] The core group of his force was about 25 men, called “Sahuanos” (Shawnees) which included Anglos, Mexicans, escaped Black slaves and Shawnee, Delaware, and Creek Indians, including his second in command, a Shawnee named Spybuck.[4]”