province of Tingi fell to Spain, that measure was only the outward carrying out of what in reality had long subsisted. It was for Baetica what Germany was for Gaul; and, far from lucrative as it must have been, it was perhaps instituted and retained for the reason that its abandonment would even then have brought about an invasion of Spain similar to that which Islam accomplished after the collapse of the Roman rule. [Sidenote: The Gaetulian wars.] Beyond the limit of fixed settlement herewith indicated,--the line of frontier tolls and of frontier posts--and in various non-civilised districts enclosed by it, the land in the two Mauretanias during the Roman times remained doubtless with the natives, but they came under Roman supremacy; there would be claimed from them, as far as possible, taxes and war-services, but the regular forms of taxation and of levy would not be applied in their case. For example, the tribe of Zimizes, which was settled on the rocky coast to the west of Igilgili (Jijeli) in eastern Mauretania, and so in the heart of the domain of the Roman power, had assigned to it a fortress designed to cover the town of Igilgili, to be occupied on such a footing that the troops were not allowed to pass beyond the radius of 500 paces round the fort.[284] They thus employed these subject Berbers in the Roman interest, but did not organise them in the Roman fashion, and hence did not treat them as soldiers of the imperial army. Even beyond their own province the irregulars from Mauretania were employed in great numbers, particularly as horsemen in the later period,[285] while the same did not hold of the Numidians.