Multiple disk failure - recover?

Hi!

I have (had) a three disk RAID5 array. One of the disks (sdb2) has failed,
however, under circumstances, two of the diskes were kicked out of the
array.

I tried re-assembling the array using 'mdadm --assemble --force /dev/md1
/dev/sda2 /dev/sdc2 /dev/sdb2', but it always takes the sdc2 & sdb2 as OK
disks and sda2 as failed.

Of course, when the reconstruction hits the bad area on sdb2, it all fails
again.

How can I tell mdadm that /dev/sda2 and /dev/sdc2 are the disks I want as
'good'!?

Thanks, D.