>> Many of the victims are too young to understand why they're here. In this emergency field hospital near Mosul's front line, it's mostly women and children filling the beds. There have been thousands of civilian casualties as the Iraqi government tries to drive Islamic State fighters from what was once their main stronghold in Iraq.
Reuters correspondent Angus MacSwan is at the clinic.>> By day you can hear the sound of battle from here, and by the afternoon and the evening the casualties are coming in. These are civilian casualties, many of them women and children with horrific wounds from sniper fire, shrapnel, all sorts of blasts, booby traps, and it's really a pretty heart wrenching sight to see.
Young children laid out in their beds in such a dramatic state. The hospital is run by the Samaritan's Purse, a Christian charity and it's working in conjunction with Iraqi government. The doctors, and the nurses, and the staff are volunteers from the United States mostly, but also from Canada, Britain and other cities and they working conjunction with Iraqi national people.
>> Being so close to the conflict means the hospital can save lives that might previously have been lost, or in some cases, just provide comfort in the victims final hours.>> He didn't have his parents with him, but he had about 10 people around his bed, holding his arms and hands and feet.
So, he knew that he was loved and taken care of.>> This mobile clinic has treated more than 1,000 patients. The flow of maimed and wounded is rising as the battle rages in the closely packed houses and narrow streets in the west of the city. More than half a million civilians are believed to be trapped there.
Aid agencies warn the worst is yet to come.>>