Former UN commander Bob Stewart has called for the coalition forces to protect civilians as the battle for Mosul carries on because "Isis won't."
After beginning yesterday, a major offensive to retake Mosul is said to be "going well", according to military commanders who are heading up the assault.
The Pentagon appears to have confirmed this with a statement that the Iraqi forces are "ahead of schedule" as the second day of the battle continues, despite fierce resistance.
Colonel Stewart, a former UN commander in Bosnia and now the MP for Beckenham, explained to Julia Hartley-Brewer why the city is so important, and how long Isis forces in the city could withstand a siege. He highlighted that it will be mainly down to ground forces to protect the large number of civilians who are at risk from the battle.
Listen to the interview above.