[2] He embarked on his military career late in 1757 when he took part in the disastrous (for France) Battle of Rossbach, receiving but surviving fourteen injuries, and retaining his "colours", albeit in a badly shredded condition.

The early years of the French Revolution found the Marquis of Beauchamps on the wrong side of events, and he emigrated to Liège[3] where he had property and family connections.

However, as the Revolutionary Army rolled across into what later became Belgium his estates in Liège were confiscated and he was driven into a remoter exile,[3] staying with the Duke of Brunswick who was another (more distant) relative.

[3] At the start of 1802 he was still banned from France, and Beauchamps again requested a favour of his former neighbour and friend, Michel-Louis-Étienne Regnaud de Saint-Jean d'Angély, who by now held a senior government position and was on excellent terms with the First Consul.

Beauchamps quickly expressed his conviction that his name must be on the police list because of the passionate protest which d'Angély had himself composed on his behalf thirteen years earlier, against the actions of the States General.

[1] Charles-Grégoire de Beauchamps married his first wife, Marie Anne Jeanne Françoise van Buel, (1710-1778) on 7 June 1761 in Liège, at that time in the Austrian Netherlands.