Well from what I can remember (Penguin Classic's names):
The Persian Expedition - Xenophon
The Campaigns of Alexander - Arrian
The Gallic Wars - Caesar
The Life of Alexander - Plutarch
Part of the Early Days of Rome - Livy
Germanica - Tacitus
About 1/4 of the Histories - Herodotus
Part of The Pelponessian Wars - Thucidyes