Fence repair

Here's a few pics of a raised bed on my patio that has the fence behind it falling over. I'm going to rebuild it on the backside and add a few ribs across the top in the bed. I think, other than the weight of the soil, the fence also fell over because it only had one post.

If I add the ribs to the bed will I be fine just using one post to rebuild it, or should I still install one on each end?

The first pic is the bed before I started, and the next three are where I'm at now. Hoping to...

Fence repair