Advice if Farmed:

One of the most frustrating thing that can happen to you is getting your entire army of troops wiped out by a high level player or good teamwork by other strong alliances (fair enough).

It is OK to lose resources. But losing your entire army as well means you have to rebuild your army as your oasis levels lower everyday. You have to rebuild your army then, re-occupy the oasis again. Double whammy.

Tips to prevent being farmed

1. Join an/their Alliance - I do not attack people with Alliance yet
2. Level Up - Shows you are active. However, it can be a double-edged sword as high level players may prey on you for prestige.
3. Go Hunting - Hide your troops by hunting before going offline
4. Use up your Resources - Maximize your available resources by upgrading. Upgrade your Cranny (it's cheap anyway).
5. Sell Highest at Market - Sell your resources at the market with the highest price. You can cancel them anytime to get them back. You will need people.
6. Build Traps - Deterence, I am active. Besides, you can net some catapults if they attack with no infantry
7. Write a letter - Most people are cool. At least they know you are active

Another tip is, you can sell your resources if you want, but if you actually need the resources later on, use the market as your bank. Set the price to the maximum and sell it, nobody will buy them as it's expansive but it's a good way to store them. Keep in mind that this can't be done when you are being attack.