Schwalbach was an NCO with 5/60th who was commissioned into Portuguese service in 1808, went on to rise to general after the war, and was active in the civil wars of the 1820s and 30s. Until recently I thought he died in 1847 at a reasonable 73 years of age. But I have now found multiple sources saying 1874 making him an improbable 100 years old when he died. Do any Portuguese members have any idea which is right? @Rui Moura for instance? You can read my blog on Schwalbach here: https://daringdutycunningplans.wordpress.com/2020/06/27/the-very-long-life-of-johann-schwalbach/
@Rob Griffith John Schwalbach, 1st Viscount of Setúbal, died in Estremoz in 1847 at 73 years of age. It is true that are many sites on the web with the wrong date 1874.
If you want I can send you a short military biography of João Schwalbach published in the book: "Os Generais do Exército Português, II Volume, I Tomo. Biblioteca do Exército. Lisboa, 2005", entry 19-0387, pages 242-243."
You can also find some of his manuscripts and letters on the website of the Arquivo Histórico Militar:
Schwalbach (28 results): https://arqhist.exercito.pt/results?t=schwalbach
Schwalback (3 results): https://arqhist.exercito.pt/results?t=schwalback
Schewalbach (1 result): https://arqhist.exercito.pt/details?id=125039&ht=schewalbach
On the Portuguese lists of wounded:
Combat of Port of Maya (25 July 1813): Captain João Schwalback (Caçadores 6)
Thanks @Rui Moura
@Rob Griffith please find attached a scan of João Schwalbach (1774-1847) short military biography:
I attach a portrait and his Challis Card.
Note: he had two sons who were also Portuguese Army officers. One of them had a very similar name João Pedro Schwalbach (1817-1878) and was also a Flag Officer, and that can cause some confusion.
Thank you Rui! Yes, I'd love to see the biography. I did think 100 was highly unlikely but even the British Museum had the 1874 date. I suppose it started with a simple transposition of the numbers.