'Don't you see that if this is the year fifty-five, Julius Caesar may happen at any moment.' 'I thought you liked Caesar,' said Robert.
'So I do--in the history.

But that's different from being killed by his soldiers.' 'If we saw Caesar we might persuade him not to,' said Anthea.
'YOU persuade CAESAR,' Robert laughed.
The learned gentleman, before anyone could stop him, said, 'I only wish we could see Caesar some time.' And, of course, in just the little time the Psammead took to blow itself out for wish-giving, the five, or six counting the Psammead, found themselves in Caesar's camp, just outside Caesar's tent.

And they saw Caesar.

The Psammead must have taken advantage of the loose wording of the learned gentleman's wish, for it was not the same time of day as that on which the wish had been uttered among the dried ferns.

It was sunset, and the great man sat on a chair outside his tent gazing over the sea towards Britain--everyone knew without being told that it was towards Britain.