CAIRO - Field Marshal Mohamed Hussein Tantawi, the head of the ruling Supreme Council of the Armed Forces, will show up in court Saturday to testify in a case in which former president Hosni Mubarak is charged with ordering the killing of protesters during the January 25 revolution, a military source said. "Tantawi will give his testimony on Saturday as scheduled," the source was quoted as saying. Ahmed Refaat, the chief justice of the court trying Mubarak, his two sons and his interior minister Habib el-Adly, had subpoenaed Tantawi and his Chief of Staff Sami Annan to testify a fortnight ago. Both of them failed to attend the court because of the insecurity following the attacks on the Israeli Embassy in Giza. Refaat re-subpoenaed them.