Sacred Haven of Debauchery

In general, ground warfare in the space age is like the Polish using cavalry with sabers when German and Soviet tanks attacked Poland...

Established a blockade over the garden planet.
The only change for the locals is that they can now keep a portion of the grown turnips instead of sending them to the capital.
By the way, the Poles attacked tanks not with sabers, but with anti-tank rifles. But they did use horses.