The numbers

Different sources and researches give the Norman army different numbers of soldiers. But I don't think that the exact numbers of soldiers is that important, it doesn't matter to me if there were 7 500 or 12 000 Normans. Instead what are important are the proportions between cavalry and infantry, between Normans, Bretons and Flemish and between the Normans and the Anglo-Saxons. Osprey gives 4 parts cavalry, 8 parts heavy infantry and 3 parts archers/crossbowmen. Osprey do also gives that there were 8 parts Normans, 4 parts Bretons and 3 parts Franco-Flemish troops. These numbers are of course highly speculative, but I think its better then nothing.