In the previous post you talked about a 10' high wall.

Here you say the posts are 10' tall.

I think you are going to have a tough time holding up a wall with no footings, .

Seriously, cedar is not a very strong wood, and not to rain on your bargain, but you will need to put those posts awfully close together to hold back 10' of dirt.

Other than that any good preservative will help.

Best of luck.

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