(PR#10005) stupid AI fortifies their attacker

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In the savegame (attached separately) I have just founded Kericho. 
Unbeknownst to me there was an enemy chariot two tiles away.  This
chariot must have been there for a long time (since back when we were
allied) since my frontier cities have been there for a long time.  But
the chariot didn't swoop down to the southeast into my woefully
undefended interior cities, nor did it retreat back northwest into my
adequately defended frontier cities.  I guess it just sat their
fortified the whole time?

After founding the city, the chariot still doesn't move in to take it
undefended.  Instead it sits there fortified until I come kill it.

I'm playing under a modified version of the effects patch.

jason