All that's known exactly is that the Raven Guard landed with 80,000 Astartes and escaped with around 3,000.
Originally it was given in the novel "Fulgrim" that the combined size of the defending Traitors (WE, DG, EC, and SoH) was 30,000 but the sizes of all the Legions were changed in the FW book series and later HH novels as it was decided that the original numbers were far too low for a single battle in a conflict that tore the Imperium in half.
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