Iraqi forces are battling Isis in eastern MosulReutersIraqi troops are set to launch a three-pronged assault on eastern Mosul in a bid to drive Isis fighters out of the city, following reinforcements.After being stalled on the edges of Mosul for weeks, replenished Iraqi forces will now attempt toovercome Isis resistance to recapture the militant group’s last main bastion in the country.In an attempt to isolate militants in the eastern sector from those in the western half of Mosul, warplanes from the US-led coalition destroyed the last remaining bridge over the Tigris river, which runs through city centre.Read moreIsis 'will be eliminated from Iraq in three months',says country's PMWorshippers celebrate Christmas in a town finally liberated from IsisIsis car bombs kill 23 people in recently liberated district of MosulSo far in the Mosul offensive, Iraq’s counter-terrorism forces, which are by far the military’s most seasoned unit, have done most of the fighting, pushing in from the east.However, regular army troops on the city’s southeast and northern edges, as well as Federal Police further west, have not moved in weeks, unable to penetrate the city either because they are not equipped or trained to fight on the streets, or because of inadequate resources.Abdul-Wahab al-Saadi, commander of the counter-terrorism forces in eastern Mosul, said units of the Federal Police have joined units from the military’s 9th Division southeast of Mosul, while troops have taken positions alongside units from the army’s 16th Division on the north side.Lt Gen al-Saadi would not say when the advance would begin, but it appears likely within days, weather permitting. He would not give details on the size of the reinforcements.