I have what I would consider a severely damaged portion of my wood siding. To give a bit of a back story, we just purchased our house and next to the front door steps the previous owners had a flower bed/bush which consisted of a mound of dirt that was about 2-3 feet high. This dirt was piled up against the wood siding over the concrete foundation. Thankfully, this side wall leads into the garage and not into the main portion of the house, but the damage is still done. I will include pictures below.
Yesterday, I removed the bush and the majority of the dirt down to about 6 inches below the top of the foundation line. From the top of the foundation there is a good foot to foot and a half of siding missing from it rotting away. It has gone into the wall a little as well, all the barrier is rotted away and into some of the insulation. You can see that some of the 2x4 is affected too. There is no damage on the interior side of it that we can tell anyway. Apparently the previous owners didn't know what the heck they were doing and rotted the siding away from the dirt. Normally, I would have just used a Wood Epoxy to fix the siding, but there is nothing there to fix!
I really am not even sure how to go about correcting this, or if I even can do it myself. Any input would be great!