Barn foundation on slope

OK, this darn barn is on a minor slope (the whole block slopes). The lower side has somewhat washed out leading to other problems (rot, sag). The original foundation is mortared stone, but I'm pretty sure there's no footer. I'm not even sure there's an up-slope foundation on the other side; for certain there's water flow, as this is all downhill from other things, and sending the water someplace else isn't much of an option.
My thinking is that when I replace this foundation, I should treat it as a retaining wall, and make sure it has weep holes, a french drain, and the like. Smart? What else can I do to reduce the wash-out and keep the problems from spreading? Vents? (It's open to the air now, though.)
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Plant some shrubs or grass to prevent erosion.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Yaofeng wrote:

Wrong end of the slope.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.