 Caesar, with two legions (three thousand soldiers and a thousand horsemen), has no fear of the Egyptian army but learns Achillas also commands a Roman army of occupation, left after a previous Roman incursion, which could overwhelm his relatively small contingent.As a defensive measure, Caesar orders Rufio, his military aide, to take over the palace, a theatre adjacent to it, and Pharos, an island in the harbour accessible from the palace via a causeway that divides the harbour into eastern and western sections.From Pharos, which has a defensible lighthouse at its eastmost tip, those of Caesar's ships anchored on the east side of the harbour can return to Rome.