On war / by Carl von Clausewitz ; transl. by J.J. Graham ; with introd. and notes by F.N. Maude Pickelhauben (spiked helmets) : the glittering age, German headdress from the seventeenth to the twentieth century, 1650-1918 / Eric J. Johansson Traité des grandes opérations militaires / Jomini. Première partie: Histoire critique et militaire de Frédéric II / Jomini : Tome second