Adeptus Titanicus (1988), p32 — Titan Battle Colours

The rebel Titan Legions of the Horus Heresy maintained their old colours in most cases: the black, white and yellow of the Fire Masters; the black, yellow and blue of the Tiger Eyes; and the black, white and red of the Death's Heads. Imperial Banners, however, were universally replaced by flags showing the Eye of Horus, the mark of the rebellion.