I have to say, that's a pretty refreshing outlook on the history of Alexander's invasion of the Persian Empire. Most history books tend to present it as a non-stop parade of flawless successes from the genius Alexander who toppled without any real problems a massive empire. Those stories also tend to portray Darius as a rather weak and ineffectual emperor who was also a coward who didn't dare fight Alexander personally at any of the battles where he was present.

An interpretatio Graeca (not sure if that's how you spell it) of history, anyone?