Valerius Maximus (A.D. 30) states that the Romans landed on a falling tide, which cannot be reconciled with Caesar's own narrative (see p. 88). The idea may have originated in the fact that it was probably the approaching turn of the tide which forced him to land at Deal. He could not have reached Richborough before the ebb began.
Every soldier was four feet from his nearest neighbour to give scope for effective sword-play. No other troops in history have ever had the morale thus to fight at close quarters.
See Plutarch, 'De placitis philosophorum.'