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FRENCH INFANTRY
The usual organisation of the majority of regiments was of 1 or 2 battalions, exceptionally to 3 or 4 battalions. The war showed clearly the weakness of the regiments constituted with only one battalion. Hence the reorganization of the army in december 1762 that increased the battalions in each regiment.
Since 1 August 1755 each battalion consisted of 16 companies of fusiliers, 1 company of grenadiers and a regimental staff. The ordonnance on 17 August 1757 increased each battalion with one more fusiliers company.
The regimental staff comprised the colonel, 1 colonel lieutenant, 1 major, 1 assistance-major, 1 chaplain and 1 surgeon. The ordonnance on 1st January 1755 restored for colonel and lieutenant colonel the privilege to command the two senior companies, this permission had be abolished in february 1749.
The fusilier companies consisted of 1 captain, 1 lieutenant, 2 sergeants, 3 corporals, 3 lance corporals (ansepessades), 31 fusiliers, 1 drummer.
The company of grenadiers comprised 1 captain, 1 lieutenant, 1 sub-lieutenant, 2 sergeants, 3 corporals, 3 lance corporals (ansepessades), 36 grenadiers and 1 drummer. According to the regulation the captain of grenadiers did'nt exceed 45 years old, similarly the lieutenant, sub-lieutenant and sergeants did'nt be more than 40 years old.
The full strength of a battalion comprised 685 soldiers and 35 officers, but companies never were complete because of the insufficient of recruitment, woundeds, diseaseds, deserters or prisoners. In may 1757 a report wrote by M. de Cornillon general major for the infantry indicated an average strenght of 550 men in each battalion in campaign. In order to complete this weakness units an ordonnance on 1st May 1757 allowed to enrol up to five foreigners in the french infantry regiments.
Information found here
http://vial.jean.free.fr/new_npi/