I am working on this project with Moises Gaudencio.
Sometime in 1812, Marshal Beresford started requiring every regimental, brigade, and divisional commander, as well as the cacadore battalion commanders and artillery commanders, to write an after-action-report any time they were in combat. These reports are equivalent to the dispatches that the army commander would send home after a battle. Many of these reports still exist. Not surprisingly 95% of them are in Portuguese, but some are in English, and one is in French. They have never been published in any language before. Moises has found over 175 of them and translated them into English.
About 100 years ago, Charles Oman wrote his seven volume A History of the Peninsular War. It is very good, but relies heavily on British and French sources. It appears that he had limited access to these reports or did not know about them. So his information on Portuguese contributions is lacking or wrong at times. This will fill many of the gaps in his History!