Not so great general. Any ideas?

Did some quick tests to confirm what I already guessed: You can't put ANY improvement on an oasis-tile:
 
You can't.
You are not at war with hiawata , you cannot plant in his territory.
You can however claim some of his land by planting a citafdel in a tile you own close to the border but that's it.
 
Karmah, if you have open borders, you can plant a GG in enemy territory. I am pretty sure the issue was planting on a forest when not at war.
 
Karmah, if you have open borders, you can plant a GG in enemy territory. I am pretty sure the issue was planting on a forest when not at war.

Yep this is the answer.

I've planted Citadels in other Civs territory when at peace plenty of times.
 
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