If you enjoyed my run through the 1799 campaign in Italy on Napoleonic Quarterly, https://open.spotify.com/episode/5hmLvz1XdJCfUTifzdGqgM you will enjoy a new YouTube channel called 'Russian Eagles'. The producer has started with a series on the 1799 campaign showing the main troop movements.
He is currently on No.4 at the Trebbia.
Were any Russian troops present during the battles of Hoogstraten and Merxem/Merksem in January and February 1814? 11 Jan 1814 Battle of Hoogstraten (Bülow) 13 Jan 1814 First Battle of Merxem (Bülow & Graham)
2 Feb 1814 Second Battle of Merxem (Bülow & Graham)
Alexander Benckendorff's (former) corps including Stahl II's and Knipper's brigades was close, as was Chernyshev's flying column, but I haven't been able to pinpoint those. If any Russians were present, the most likely ones would be cossacks under Bülow.
I can't speak with certainty for Hoogstraten, although I do not believe there to have been any Russian troops there, but there were certainly none in the two Merxem actions, which I researched for my book on Graham's campaign. The only Russians that the British troops encountered were Benckendorff's troops at Breda earlier in the campaign.
The British role in the second coalition against France 1797-1802
Thomasson, Joan Gilmore
Univ. of Arizona, 1966
https://repository.arizona.edu/bitstream/handle/10150/317914/AZU_TD_BOX42_E9791_1966_126.pdf
Role of British Foreign Policy in the First and Second Coalition, 1792-199
Muhammed Manayri
Kansas State Univ, 1965
https://core.ac.uk/reader/33368690
France and the First Coalition before the Campaign of 1796
J. Holland Rose
The English Historical Review , Apr., 1903, Vol. 18, No. 70 (Apr., 1903), pp. 287-302
https://www.jstor.org/stable/pdf/549464.pdf
Dave will do