[ILUG] raid failure

[Steven Satelle]

I have a box in the attic running debian testing, with a raid 1 device
in it (software raid using mdadm - v1.9.0), I accidentally cut the power
to the box down today and when it came back up the raid device failed.
mdadm --examine on both devices in the array show them as being part of
the array with no problems, I can run fsck on the /dev/hdxx with no
errors but /dev/MD0 is gone and I haven't a clue how to get it back.

My /etc/mdadm/mdadm.conf fiel contents is:
earth:~# cat /etc/mdadm/mdadm.conf
DEVICE partitions
ARRAY /dev/md0 level=raid1 num-devices=2
UUID=9d64a945:279503f7:b3f06b53:bbe8a665
   devices=/dev/hda6,/dev/hdb2

when I run:
mdadm --assemble --scan
I get back
mdadm: no devices found for /dev/md0

Does anyone know how to get it back without having to rebuild it?