It is therefore evident that the conquest of the country took a long time to effect--not less, indeed, than two hundred years. First, Kent, with Surrey, fell; next, Sussex; both before the end of the fifth century. Early in the sixth century the West Saxons conquered the country covered by Hampshire, a part of Surrey, and Dorsetshire; next, Essex fell, and there was stubborn fighting for many years in the country about and beyond the great Middlesex forest. The conquest of the North concerns us little, save that it drew off some of those who were fighting in what afterwards became the Kingdom of Mercia. I desire to note here only the surroundings of London, and to mark how, by successive steps of the invaders' march, it was gradually cut off, bit by bit, from the surrounding country. Thus, when Kent was overrun, the bridge gate was closed, the roads south, south-west, and south-east were blocked, and the whole of that country cut off from London; at the fall of Essex, Norfolk, and Suffolk, the eastern gate was closed, and that great district was cut off. When Wessex was an established kingdom, the river highway was closed; there then remained only the western gate, and that, during the whole of the sixth century, led out into a country perpetually desolated and destroyed by war, so that, by the middle of the sixth century, no more communication whatever was possible between London and the rest of the country, unless the people made a sortie and cut their way through the enemy. Observe, however, that no mention whatever is made of London in the _Chronicle_. Other and less important towns are mentioned. Anderida or Pevensey, Aquæ Solis or Bath, Gloucester, Chester, and many others; but of London there is no mention. Consider: London, though not much greater than other cities in the country--York, Verulam, Lincoln, Colchester, for instance--was undoubtedly the chief port of the country. We must not bring modern ideas to bear when we read of the vast trade, the immense concourse of merchants, and so forth. We need not picture miles of docks and countless masts. Roman London was not modern Liverpool. Its bulk of trade was perfectly insignificant compared with that of the present. When we begin to consider the mediæval trade of London this will become apparent. Still, it was, up to the coming of the Saxons, a vigorous and flourishing place, and the chief port of the country. Why, therefore, does the _Chronicle_ absolutely pass over so great an event as the taking of London? Such is the evidence of history. Let us consider next the evidence of topography. We shall understand what happened in London when we understand the exceptional position of London and the dangers to which the city in time of civil war was necessarily exposed.