Unlocking Napoleon's battles?

I have completed the Italian campaign and I'm maybe a 3rd of the way through the Egyptian. In looking at the unlockable battles of Napoleon, I see that only the battle of Lodi is unlocked while the battle of Arcole is not. I assumed since the date for this battle is listed as 1797 that it was part of the Italian campaign and would be unlocked when I finished. I completed all the missions assigned prior to taking the last city of Klagenfurt.

Anybody know what I am missing here?

Thanks

Never-mind. I saw in the manual that the set piece battles must be played sequentially, which I guess means they are independent of the campaign and are unlocked as one wins the previous unlocked battle. I haven't even tried the battle of Lodi yet, and I guess I'll save them for after I finish with the campaigns.