You can indeed attack an opponent occupying a resource node in order to disrupt them.
I advise you to pay attention to a few important details before proceeding with the attack.
I will compile a useful list for you:
- Send a Unit to scout
- Get a report showing the opponent's Power and review it from the Inbox--> Scout Reports
- Select enough Units so that the power is higher than the opponent's
After the attack, you can check the battle results from the Combat Reports in your in-game Inbox (Envelope icon on the Bottom right corner of the game screen). Please be aware that the battle might cause permanent loss of some of your Units.
Over and out.