Its all in OR 2 on 1st Manassas. Like usual, the Union rarely owes up to losing a flag.
Union regiments that lost a flag at 1st Manassas (updated)
1st Michigan, both flags captured (this regiment's dead was the farthest then any other Union regiment). 4th Virginia captured the flags.
69th New York--both flags captured, not on the battlefield but on the retreat by Col Radford's Cavalry.
Major Wheat's Bttn, "Captured a stand of Colors" ??
Griffen's Battery flag was captured--either the 33rd Va or 27th Va captured this flag.
Col Terry's Cavalry took down a "Large Garrison Flag", and "Federal flag on the cupola, Fairfax Court House".
Now the Confederate report was: 1 Garrison flag and 10 regimental colors captured.
10 Artillery pieces were captured on the battlefield and 18 more on the retreat.
So the total flags (that I have found captured) is 8. I think the missing flag is an artillery flag, from the Rhode Island Battery A (which was captured).
The "Fighting 69th" would lose a flag at Fredericksburg also. Anderson's Division captured the flag "1st Irish Regiment"
The 69th New York aka 2nd NY Militia was the very first Union regiment to cross the long bridge into Alexandria. They formed a semi-circle and dug in, to await other Union regiments to follow up.
The 69th New York was first in total lost in all New York Regiments.
I had a family member in the 100th Indiana, at Tunnel Hill he was probably laying down for dear life, not to far from your Great Grandfather in the 90th Illinois. Here another family member was in the 25th Texas Cav was shooting at them lol.
Have a good morning,