By Stijn Mitzer and Joost Oliemans

The battle for Mosul has entered its seventh month of fierce fighting for the largest city in the hands of the Islamic State, with the most difficult fight for Mosul's Old City still to be fought. Facing a much stronger opponent with a large number of armoured fighting vehicles, special forces and air support, the Islamic State employs tactics that have become so characteristic for this organisation in its fight against Iraqi forces, including the large-scale use of VBIEDs in the narrow streets of the city.