Operation Karbala-4

On 25 December 1986, Iran launched Operation Karbala-4 (Karbala referring to Hussein ibn Ali's Battle of Karbala). According to Iraqi General Ra'ad al-Hamdani, this was a diversionary attack. The Iranians launched an amphibious assault against the Iraqi island of Umm al-Rassas in the Shatt-Al-Arab river, parallel to Khoramshahr. They then set up a pontoon bridge and continued the attack, eventually capturing the island in a costly success but failing to advance further; the Iranians had 60,000 casualties, while the Iraqis 9,500.