By 1927, his forces had overrun most of the central Arabian Peninsula, but the alliance between the Ikhwan and the Al Saud collapsed when Ibn Saud forbade further raiding. The few portions of central Arabia that had not been overrun by the Saudi-Ikhwan forces had treaties with London, and Ibn Saud was sober enough to see the folly of provoking the British by pushing into these areas. This did not sit well with the Ikhwan, who had been taught that all non-Wahhabis were infidels.