Columbia subject headings:
Armies--Islamic Empire.
Islamic Empire--Armed Forces--Recruiting, enlistment, etc.
Slavery and Islam.
Slavery--Islamic Empire.
Soldiers--Islamic Empire.
Harvard subject headings:
Armies--Islamic Empire.
Islamic Empire--Armed Forces--Recruiting, enlistment, etc.
Slavery and Islam.
Slavery--Islamic Empire.
Soldiers--Islamic Empire.
Princeton subject headings:
Armies--Islamic Empire.
Islamic Empire--Armed Forces--Recruiting, enlistment, etc.
Slavery and Islam.
Slavery--Islamic Empire.
Soldiers--Islamic Empire.