Hello Tom,
Well, I think I had two things in my favor last Saturday. Yes, I was on flat ground. That must've helped matters to a large degree. Secondly it was much colder last weekend than when I got stuck. I think that sometimes as it gets warm out and the snow begins to melt, it seems to be extra slippery. When it's mind numbingly cold the snow actually acts a bit sticky. Saturday wasn't freeze the snot in your nose cold but it was only in the mid 20's.
Regards,
Chris