Proper way to secure wood retaining wall?

I’m redoing retaining wall with 6x6x8 wood. When anchoring it to the ground which is better for securing it?

Started to redo the wall

Deadman anchor in the ground vs posts along the side to be more secure?

I think digging in the ground will be a lot more work then I anticipated. If I did 3 feet down vs outwards will it make a difference?

submitted by /u/Helanda
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from DIY https://ift.tt/36vuXUr