Cob Ferro-cement-Lime in clay

[Mona Brookes]

Shannon...

{snip}
Neither lime/sand or cob provide any significant strength as a mortar.
When these materials are used it should be assumed that they are being
used as a filler to block air flow, insects, or rodents, and to further
improve the stability of the material being mortared.  If you are
concerned about the strength of a wall other than in compression
(earthquakes, car impacts, etc.), than you shouldn't be using cob or
lime/sand.
{snip}

You commented in a recent reply that cob could withstand car impacts... 
is that true??

I was wondering how much protection it would give against some larger 
wild animals... like bear... if a bear had in mind to push against or dig 
through would it be successful??  ...any ideas on this??

Davis