I wonder...
Is it possible that Portugal's engagement width was such that only heavies were fighting, while the OP had heavies plus a couple of galleys/lights fighting on the front line? Portugal's admiral had 2 maneuver, meaning that their engagement width should be 25*1.2=30, which is exactly enough to have 10 heavies fighting, but the OP's 1 maneuver + 20% width from other sources would have put him at 32, which would mean ten heavies plus a couple non-heavies. So if those non-heavies kept getting picked off, it might've tanked his fleet's morale to where they stopped fighting. However, I noticed that there's more than one fleet on the OP's side in the battle, so if his allies joined the fight a little later on, his fleet might have run out of morale but not retreated because his ALLIES still had some morale...but no heavies, so the OP's heavies might have just sat there being shot at while not having enough morale to fight back.
...or I could be completely off-base. Just a thought.
Is it possible that Portugal's engagement width was such that only heavies were fighting, while the OP had heavies plus a couple of galleys/lights fighting on the front line? Portugal's admiral had 2 maneuver, meaning that their engagement width should be 25*1.2=30, which is exactly enough to have 10 heavies fighting, but the OP's 1 maneuver + 20% width from other sources would have put him at 32, which would mean ten heavies plus a couple non-heavies. So if those non-heavies kept getting picked off, it might've tanked his fleet's morale to where they stopped fighting. However, I noticed that there's more than one fleet on the OP's side in the battle, so if his allies joined the fight a little later on, his fleet might have run out of morale but not retreated because his ALLIES still had some morale...but no heavies, so the OP's heavies might have just sat there being shot at while not having enough morale to fight back.
...or I could be completely off-base. Just a thought.