The Times of London edition for July 30, 1807 contains the following information attributed to newspapers received from Hamburg:
"Antwerp, July 1 -- The Westphalian Regiment arrived here a few days ago. Almost all the men are from the North of Germany, and do not understand French. About two days after, the Irish Brigade, about 1,200 strong, entered Antwerp. It consists of grenadiers, voltigeurs, sappeurs [sic], etc. and an excellent band of music. This fine corps wear short green jackets, and caskets [sic], with plumes of feathers. Their eagle is decorated with a golden harp, and this inscription "The Emperor of the French to the Irish Legion."
It would be interesting to see the original report in the Hamburg newspaper, or perhaps even a similar report in an Antwerp journal.
I found some images, maybe of interest