"From the accounts of the enemy who stopped to give water to the wounded and rifle the dead, it seems that the 8th cut to pieces the 6th Massachusetts, half demolished the Rhode Islanders, and made deadly havoc among the Regulars.
But a horrible mistake occurred at this point. Their own friends taking them for the enemy, poured a fatal fire upon their mutilated ranks."
The 6th Mass. received a new flag from the local citizens of Baltimore on July 4, 1861. I doubt that flag would look like the 1st Confederate National. I have a photograph of the reverse side of the flag and it looks nothing like a 1st Confederate National.
Reference below.