Iranian-backed militias entered Syria overnight from Iraq and were heading to northern Syria to beef up beleaguered Syrian army forces battling insurgents, according to two Syrian army sources.Dozens of Iran-aligned Iraqi Hashd al-Shaabi fighters from Iraq also crossed into Syria through a military route near Al Bukamal crossing, a senior Syrian army source told Reuters.For all the latest headlines follow our Google News channel online or via the app.“These are fresh reinforcements being sent to aid our comrades on the front lines in the north,” the officer said, adding the militias included Iraq’s Kata’ib Hezbollah and Fatemiyoun groups.Iran sent thousands of Shia militias to Syria during the Syrian war and, alongside Russia with its air power, enabled Syrian President Bashar al-Assad to crush the insurgency and regain most of his territory.A lack of that manpower to help thwart the armed oppossition group’s onslaught in recent days contributed to the speedy retreat of Syrian army