The troops leaving Kassel on 13 May 1792 were:
a detachment of the Garde du Corps
Later, the following units joint the corps to bring it to the strength of 6000 men:
The artillery was comprised of 16 threepounder guns regimental artillery and 2 onepounder guns ("Amüsetten"), the latter being attached to the Jäger-Corps.
Source: Renouard, Geschichte des französischen Revolutionskrieges im Jahre 1792, Cassel, 1865, pp. 119 ff.