By Chris Hughes The Middle East was braced for war between US and Iran-backed forces on Monday night after a drone strike killed three American soldiers. Another 34 soldiers were injured when a remote US outpost in Jordan was hit by increasingly aggressive pro-Iranian militia who are based in Syria. President Joe Biden vowed the US “shall respond” to the attack on logistics base Tower 22 on Sunday. It is believed Tehran-backed groups behind about three months of attacks on US and UK sites have been ordered to relocate to avoid airstrikes. Around 150 missiles, including rockets, drones and bal…