As your inquirer mentions the date 1810, we must presume that he is referring to the Regiment de Garde Nationale de la Garde Imperiale. This unit was added to the Imperial Guard in 1810 after the showing made by the National Guard proper during the Wacheren invasion. Curiously for a Guard formation this two battalion regiment had line organisation (i.e. six companies: two elite, four centre). In 1813 it was transformed into the 7th Voltigeur Regiment presumably acquiring the organisation and uniform of that unit in the fullness of time.

This leads us neatly onto the subject of uniforms of this corps. As a part of the Chasseur corps it wore a uniform which closely resembled the Chasseurs A pied; in that it had white pointed lapels, red Polish (pointed) cuffs piped white, and the sabrebriquet was universal. It differed in having the short tails so character1stic of the Young Guard (to which it belonged), and the following line features: red collar piped white, red piping on the lapels, white turnbacks piped red with the appropriate turnback badges (Grenadiers: red grenade, Fusiliers: blue crowned eagle, Voltigeurs: green hunting horn). The company d1stinctions were as follows: all companies had a brass eagle shako plate and buttons and the pockets were vertical; the fusiliers had a white tufted pompon with the ball in the company colour (1: dark green, 2: sky blue, 3: aurore (yellow/orange), 4: violet), the cords and the sword-knot were white, voltigeurs had green tufted pompon, shako cords and sword-knot (Note: the collar is the same as in the other companies!), the grenadiers sported a red tufted pompon and shako-cords, but only the knot and the tassel were red (and strap was white). All wore the short gaiters then in vogue in either black or white according to the occasion. Officers are said to have worn Fusiliers-Chasseurs uniform, though this may only apply to the field officers. (The sources for the above are: 'Swords-Around the Throne' J.R. Elting, Weidenfeld & Nicolson, London, 1989. Osprey, Man-at-arms 160 'Napoleon's Guard infantry'(2) and 'Napoleonic Uniforms' J.R. Elting & H.Knotel, MacMillan, New York, 1993.)

If, however, your reader was seeking information on the National Guard proper, his dating was erroneous. The National Guard was formed in 1789 shortly after the dissolution of the Gardes Francaises. It continued in ex1stance until the Consulate, when it went into a state of 'suspended animation'. It was reactivated in 1805, presumably to relieve the Grande Armee of garrison and internal security duties. The 'cohort' (battalion) had 10 companies(1 grenadier, 1 voltigeur, and 8 fusilier), and cohorts were grouped together (usually in fours) to form 'Legions'(regiments). In 1812 this organisation was superseded by one more in keeping with contemporary line infantry(1 grenadier, 1 voltigeur, 4 Fusilier) and a sequence of liability to call-up. 'Premier Ban' (20-26 year olds) were to form 100 cohorts (88 mobilised for internal duties; these later formed the 135th to 156th line. The second (26-40) and arrierebans (40-60) were for dire emergencies only. Save for the crisis of 1814 they were rarely called out in total. The National Guardsmen on the peripheries probably saw the most service.

It is difficult to be specific about uniforms. The character1stic line infantry uniform had evolved from that of the national guard, so a certain similarity must be supposed. They were supposed to sport white metal buttons under the Empire, and a tendency to retain bicornes and sabre-briquets may be inferred. The full gamut of cuff varieties should be expected as well as various revolutionary details such as white cuffs and red lapels, and various combinations of the above. The above presents the optimum, a cartridge box and musket might be more appropriate in 1814. (Sources 'Swords Around the Throne' J.R. Elting, Weidenfeld & Nicolson, London, 1989 'Napoleonic Uniforms' Elting & Knotel, MacMillan, New York, 1993 and M.A.A.211 'Napoleon's Overseas Army' Rene Chartrand, Ospry, London, 1989 has some interesting details of colonial National Guards. As you can see this subject needs some research.)