While clearing earth out from under my kitchen window (which juts out about
2 feet from the house in a bay), I noticed some holes in the top of the
foundation at ground level. There actually seems to be concrete blocks on
top of the foundation, and the outer layer stops one or two courses before
the wood for the window starts. Funny thing was, all along that line of
blocks were holes, at regular intervals. It's a little difficult to tell as
it has been covered in insulation, but I think the holes are just the holes
that come in the blocks, ie they have not been filled. We have had a few
problems with mice, so I fillied in the holes with wire wool and concrete.

Were the holes there for a purpose? Will I have done any harm in filling
them in? Is this where the mice could have got in?

TIA

Mat