Hi!

The French army received their eagles on the 1st of June.

[From Osprey Publishing, FLAGS OF THE NAPOLEONIC WARS (1), p.5-6]

"The first presentation of these eagles was made on 1 June 1815 at the Champ de Mai, when 206 eagles were issued: eight to the Guard, 132 to the Infantry, and sixty-six to the Cavalry. Regiments receved one eagle, carried on a blue stave as before. The Guard Infantry received only two eagles; one each to the 1st Regiments of Grenadiers and Chasseurs. On 4th June a further eighty-six eagles were issued to the National Guard."

Flags of the Napoleonic Wars "The Empire of France" - "1815 Pattern" - "Imperial Guard Infantry" http://www.warflag.com/napflags/flaghtml/fran1815.htm

"The 1st Grenadiers and the 1st Chasseurs of the Guard each received two flags with their eagles on 1st June 1815. These flags were similar to the 1812 pattern and were 80cm square. However, there was no dedication to the Emperor or unit designation on the obverse; instead there appear battle honours. On the reverse appear city names which were out of historical sequence if meant to be more battle honours."