Muhammad ceased being a private preacher and became a political and military leader. His purpose was not to rid himself โof foreign occupation but to strive for a new universal order in which the whole of humanity would be able to embrace Islam or live under its domination.โ
Actually, in the Islamic version of the Eschaton (end time scenario), when their Mahdi (Islamic messiah who is supposed to be Muh's second coming) will already be on the scene, there will be no more need to collect the "jizya" or protection money because all who will not have converted to Islam by that time will have to be slaughtered/beheaded.