Whakaotihia te rerenga e whai ake nei: I te wa i riro ai te Republic Batavian i te Kingi o Holland i te 1806, ka kitea e Van Merlen te aroha ki a King Louis, a ka waiho hei Lieutenant Colonel i roto i te Royal Guard Hussars i te 23 o Oketopa 1806. E toru nga ra i muri mai ka haere ia me te ope taua o Netherlands ki Tiamana ki te tautoko i nga ope French i te
te pakanga ki Prussia. I kite ia i te mahi tata ki Ertzen i te 7 o Noema 1806 ka peia e ia te roopu Prussian ki Hamelin. Heoi, i puta he tautohetohe i waenga i a Louis me tona tuakana a Napoleon i hua ai te Royal Guard i whakahokia ki The Hague me te kore e kite i etahi atu mahi.