Algerian tirailleur regiments were to be made up of roughly 50% "Frenchmen of North African stock" (i.e. Arab and Berber Muslims) and an equivalent number of French volunteers and conscripts, largely drawn from the European settler community. At the same time, additional Muslim soldiers were to be incorporated into previously mostly European units such as the zouaves, until they made up to 25% of the total. Growing tensions within mixed units as the war continued, plus the threat of rebel FLN reprisals against Muslim volunteers, largely nullified this attempted reform.[5]