Digby Smith, The Greenhill Napoleonic Wars Data Book gives british losses as 4 officers, 91 men killed, 36 officers, 696 men wounded, 19 officers, 593 men "missing" and notes that "most" were from Chathams brigade. No specific source is given, but see below.
For the Battle of Bergen some days before he has Chathams brigade composed of three batallions (!) from the 4th and 31st.
The french cavalry in Brune's army at Bergen and Castricum were: 10e dragoons, 4e chasseurs cheval, 5e chasseurs cheval, 16 chasseurs cheval; 5e had 1 sqdron, the other regiments 4. (There were also som batavian horse in the army).
He lists four soruces for these two battles
- Fortescue, A History of the British Army
- Sir W L Clowes, The Royal Navy
- William James, The Naval History of Great Britain from the Declaration of War by France in 1793 to the Accession of George IV
- Alexander Michaelovsky-Danielevsi, Geschicht des Kriegess Russlands mit Frankreich under der Regierung Kaiser Paul I, 1799