Your answer should be "<span>They used the Roman army to invade and take the land."
The third answer is wrong for the time of the Roman army and the second doesn't make sense. With such a strong army, many countries just relented to them rather being conquered or killed, so why would the Romans pay?
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Jerusalem... in this time period it included regions in northern Egypt (where Jerusalem is) and an extremely small portion on the western edge of the Arabic peninsula, and then in 1020 the empire included Jersulem. Around 1360 the empire expanded yet again to include Rome. Cordoba, to my knowledge, was not ever included in the Empire
they had to change everything up because the cause was to spread change
after and before there where innovations that could not be changed without war
