3. Grave breaches of Scheduled Conventions.

(1) Any person, whatever his nationality, who, whether in or outside the State, commits, or aids, abets or procures the commission by any other person of, any such grave breach of any of the Scheduled Conventions as is referred to in the following Articles respectively of those Conventions, that is to say :
...
shall be guilty of an offence and on conviction on indictment thereof :
(ii) in the case of any other such grave breach as aforesaid, shall be liable to penal servitude for fourteen years or any less term or imprisonment for a term not exceeding two years.