Who is the British soldier who published his memoirs before 1827?

I read the German translation of the Recollections of a British soldier who served in the Peninsula. The title is "Soldatenleben" = Soldier's Life. He speaks of his voyage from Jersey to Lisbon, his comrads "John" and "Cochran", the defence of Cadiz against the French, the siege and pillage of Badajoz, the execution of deserters at Campo Mayor. Anybody know the English first edition and the name of the soldier (private, infantry)?

Thanks in advance!