Books and documents found on Wednesday in an elementary school in Arbajia, the eastern district of the city, reflected the terrorists’ widespread attempts to spread their ideology to the children of the area.

The books included many pictures of rifles and weapons, and taught children how to spell out words like Caliphate, Baghdadi and rockets.

"This is the curriculum used by Daesh (Islamic State) to teach children between the first and sixth grades.

They want to imprint on these children’s minds the ideas of terror, of crooked terrorism.

The terror which means killing your brothers, killing your fellow countrymen, killing those who believe in a different ideology or religion," said Major Ahmed of the elite Iraqi Counter Terrorism Service (CTS).

One of the children who went to school in the neighborhood recalled the odd instructions they were given by militants.

"They would teach us about bullets and how to slaughter and kill others. They would ask us to add, dead body plus dead body, bullet plus bullet. They would teach us how to slaughter, these things," said Mahmoud.

CTS troops searched the school for Improvised Explosive Devises (IEDs) or booby traps planted by the militants.

The forces had faced fierce resistance from the militants over several days, who launched waves of suicide bombers, sniper attacks and ambushes.

The CTS Special Forces spearheading the advance into Mosul are part of a 100,000-strong force of army, security forces, Kurdish peshmerga fighters and mainly Shia "Popular Mobilisation" forces aiming to drive Islamic State (ISIS / Daesh / ISIL / IS) from the largest city under their control in Iraq or Syria.

The operation, which enters its fifth week on Monday (November 14), is the most complex in Iraq in over a decade and is complicated by the presence of the more than one million civilians still living under Islamic State (ISIS / Daesh / ISIL / IS) control.

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