[meyer]

Bombs in the city center and also somewhere near the Euphrates outside the city...

Flood the tunnels?

[rundy]

Bombs in the city center and also somewhere near the Euphrates outside the city...
Flood the tunnels?

Indeed!

First, REPEATEDLY bomb the major palace and surrounding areas.
Make HUGE crater.
Systematically bomb to create a trench from the river to the crater.

Voila, the Rats are drowned!!!