Thanks, thezerch! Unfortunately, with no records of the composition Unitarian Army responsible for overthrowing Dorrego (at least on the internet) I had to make up some names. I choose Peron mainly because it was easy to remember due to the connection the more famous figure bearing that surname. I thought of making him related to OTL Juan Peron, or at least TTL's equivalent, but alas, the Perons apparently immigrated from Sardinia in the mid 1830's...
So lets hope there are some Perons in 1820's Argentina...or at least pretend there are.
!