Thy men
math  (math)
an adult (as of full length); by implication, a man (only in the plural) -- + few, friends, men, persons, small.
shall fall
naphal  (naw-fal')
to fall, in a great variety of applications (intransitive or causative, literal or figurative)
by the sword
chereb  (kheh'-reb)
drought; also a cutting instrument (from its destructive effect), as a knife, sword, or other sharp implement -- axe, dagger, knife, mattock, sword, tool.
and thy mighty
gbuwrah  (gheb-oo-raw')
force; by implication, valor, victory -- force, mastery, might, mighty (act, power), power, strength.
in the war
milchamah  (mil-khaw-maw')
a battle (i.e. the engagement); generally, war (i.e. warfare) -- battle, fight(-ing), war(-rior).