Bolos, book 6 : Cold steel : a Bolos novel

When humans face tough threats across the galaxy, there's only one option: break out the Bolos! Gigantic Al-controlled tanks with enough firepower for an army (and possessing warmer hearts than many of the flesh-and-blood creatures they protect), the Bolos battle on distant star systems to defend us all. The greater machine -- J. Steven York & Dean Wesley Smith Though hell should bar the way -- Linda Evans.