The Régiments de Ligne varied in size throughout the Napoleonic Wars, but the basic building block of the Infantry of the Line was the battalion. A line infantry battalion was numbered at about 840 men; however, this was the battalion's 'full strength' and few units ever reached this. A more typical strength for a battalion would be 400–600 men. From 1800 to 1803, a line infantry battalion had eight fusilier companies and one grenadier company. From 1804 to 1807, a line infantry battalion had seven fusilier companies, one grenadier company, and one voltigeur company. From 1808 to 1815, a line infantry battalion had four companies of fusiliers, one company of grenadiers, and one company of voltigeurs. According to the 1808 regulation, the staff of each company and the regiment HQ was the following:
