Thanks, Omanes, but actually I have been playing RTW since 2004 and I am well aware of the in-game tech trees. The problem with those is that you can't look at all factions' tech trees at once. You have to start a new campaign with each faction in order to see each in-game tech tree individually. Also, you have to actually be in the game to see those, and, as I am at work right now, I don't have the game at my disposal.

What I am looking for is a guide that shows all units for all factions and the building requirements for each. I found one of these for RTW on the internet. I have played BI and Alexander much less than RTW, however, and I would like to look at a BI unit tree where I can compare all of the factions before I decide which faction to play as.

I know there are many brilliant people here on this site, so I thought surely someone must have a guide to the BI units and buildings.

Thanks again.