FIRST SCHEDULE
(Article 2)
Crimes within the Jurisdiction of the International Criminal Court
Article 8
War crimes
2. For the purpose of this Statute, “war crimes” means -
(b) Other serious violations of the laws and customs applicable in international armed conflict, within the established framework of international law, namely, any of the following acts -
(xv) Compelling the nationals of the hostile party to take part in the operations of war directed against their own country, even if they were in the belligerent’s service before the commencement of the war
EDIT.