A Serious Tank on a Clockwork World

In the future, humanity spreads out across the galaxy, sending to the many stars armies of robots to terraform distant worlds for human needs.

On one such clockwork planet, one human lives among the androids that grow the food that feeds the galactic civilization, and all is well. Until the day when the wrong shipment of a sentient tank intent on its duty arrives and throws the perfect mechanism of this place off-kilter...

How can the sole human and his android companions handle a serious tank capable of serious damage upon their jewel-crafted world?