The great obstacle to the navigation of the river was the picturesque but obstructive Old London Bridge. Its numerous narrow arches, whose piers rested on huge sterlings, caused so great a fall in the stream that the passage through was a feat which none but experienced boatmen could safely attempt. John Mowbray, the second Duke of Norfolk, a companion of Henry V. in his French wars, nearly perished here in 1428. Taking barge with his retinue at St. Mary Overy, he prepared to pass through the bridge; but, through unskilful steering, the barge struck against the piles, and was overturned. Several of the party perished, but the Duke and two or three other gentlemen saved themselves by leaping on to the piles, and were drawn up with ropes to the bridge above. The great fall of the rushing tide through the narrow arches is well shown in the earliest known view of the bridge, which is given in the beautiful illumination of the manuscript poems of Charles, duke of Orleans, who was a prisoner in the Tower of London. The date of this interesting pictorial record has been assigned to the year 1500. The bridge consisted of a drawbridge and nineteen broad-pointed arches, with massive piers varying in breadth from twenty-five to thirty-four feet. Outside the piers were immense wooden sterlings, which were probably added later to keep the foundations of the piers from being undermined. By these obstructions the entire channel of the river was reduced from its normal breadth of 900 feet to a total waterway of 194 feet, or less than one-fourth of the whole. Peter of Colechurch was the architect and builder of London Bridge, replacing the older wooden bridge by a stone structure which was finished in 1176. The weakness of the new building, however, soon showed itself. In 1280, less than eighty years after its completion, the bridge was so decayed that men were afraid to pass over it, and a subsidy was granted towards its restoration. A hundred years later its condition engaged the attention of "a great collection or gathering of all archbishops, bishops, and other persons." Notwithstanding the counsels of this distinguished assembly, things went from bad to worse; and in a professional survey made in 1425, one of the arches was found to be cracked, and the water-course of the Thames was seen below. This was the reason of an Act made by the Court of Aldermen, that no person should drive a cart or car shod with iron over the bridge, upon pain of "punishment of his body and to pay 6_s._ 8_d._" In 1492, a reward of five shillings was given to John Johnson, that the King's "great gonne should not pass over the bridge, but rather by another way." "The other way" involved at this date a journey up river to Kingston, where the first bridge was to be found.