|The following is based on the spin off novel by Keith R. A. DeCandido and some details might contradict canon.|
He was sent there to command specifically because he was one of Nod's best interrogators. His second in command was Corporal Hugh Isembi.
When the battle began, his forces were losing and he ordered Isembi and Private Voyskunsky to lay in wait and ambush the enemy. The attempt failed and they were captured.
Al-Rashan appears only in the Tiberium Wars novel.